Anyone else have this happen to em, i had the old SR-25 never once had it happen using the FGM 210's, this afternoon it sure as hell did with my MK11.
MK11 MOD 0... slamfire...
- Thread starter skinney_7
- Start date
Re: MK11 MOD 0... slamfire...
What ammo and primers are you running? I have had 2 incidences when using reman or factory ammo where they installed light primers. Sometimes the bolt itself is too heavy or fast for these primers resulting in a slam fire, especially in M1A platforms. Springfield recommends using nothing but military primers in their literature.
What ammo and primers are you running? I have had 2 incidences when using reman or factory ammo where they installed light primers. Sometimes the bolt itself is too heavy or fast for these primers resulting in a slam fire, especially in M1A platforms. Springfield recommends using nothing but military primers in their literature.
Re: MK11 MOD 0... slamfire...
ive heard of this issue with FGM210 primers and thats what im using, never had probs on my old SR-25, or my Super SASS its pin has the spring to prevent this... a very good idea.
ive heard of this issue with FGM210 primers and thats what im using, never had probs on my old SR-25, or my Super SASS its pin has the spring to prevent this... a very good idea.
Re: MK11 MOD 0... slamfire...
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: skinney</div><div class="ubbcode-body">ive heard of this issue with FGM210 primers and thats what im using, never had probs on my old SR-25, or my Super SASS its pin has the spring to prevent this... a very good idea. </div></div>
I was just going to mention that AR-10s have a spring that retains the firing pin to (attempt to) prevent this issue.
Two things come to mind regarding ammo: primer not set flush, or soft primers. What type of ammo were you using?
Also, have you modified your buffer or buffer spring? (not sure if that can cause increased bolt carrier velocity)
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: skinney</div><div class="ubbcode-body">ive heard of this issue with FGM210 primers and thats what im using, never had probs on my old SR-25, or my Super SASS its pin has the spring to prevent this... a very good idea. </div></div>
I was just going to mention that AR-10s have a spring that retains the firing pin to (attempt to) prevent this issue.
Two things come to mind regarding ammo: primer not set flush, or soft primers. What type of ammo were you using?
Also, have you modified your buffer or buffer spring? (not sure if that can cause increased bolt carrier velocity)
Re: MK11 MOD 0... slamfire...
I did it slam fire or double tap... because if it double tapped, meaning you shot 1 one and then it shot again, that was you not the rifle.
You got bitch slapped by a 308 and your finger set it off... we see this alot with people with poor trigger control.
Now, if you closed the bolt and it shot, my apologies, but if you shot 1, then "it" shot again, that was you.
I did it slam fire or double tap... because if it double tapped, meaning you shot 1 one and then it shot again, that was you not the rifle.
You got bitch slapped by a 308 and your finger set it off... we see this alot with people with poor trigger control.
Now, if you closed the bolt and it shot, my apologies, but if you shot 1, then "it" shot again, that was you.
Re: MK11 MOD 0... slamfire...
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: djkest</div><div class="ubbcode-body">Two things come to mind regarding ammo: primer not set flush, or soft primers. What type of ammo were you using?</div></div>
trust me the primers were flush, they are handloads
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: djkest</div><div class="ubbcode-body">Also, have you modified your buffer or buffer spring? (not sure if that can cause increased bolt carrier velocity) </div></div>
no rifle mods what so ever.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lowlight</div><div class="ubbcode-body">I did it slam fire or double tap... because if it double tapped, meaning you shot 1 one and then it shot again, that was you not the rifle.
You got bitch slapped by a 308 and your finger set it off... we see this alot with people with poor trigger control.
Now, if you closed the bolt and it shot, my apologies, but if you shot 1, then "it" shot again, that was you. </div></div>
lowlight... no bitch slappin, i was loading each round individually without a mag, had the rifle pointed to the side, @ the ground with the bolt locked open, put a round in the pipe, hit the bolt catch and boom...
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: djkest</div><div class="ubbcode-body">Two things come to mind regarding ammo: primer not set flush, or soft primers. What type of ammo were you using?</div></div>
trust me the primers were flush, they are handloads
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: djkest</div><div class="ubbcode-body">Also, have you modified your buffer or buffer spring? (not sure if that can cause increased bolt carrier velocity) </div></div>
no rifle mods what so ever.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lowlight</div><div class="ubbcode-body">I did it slam fire or double tap... because if it double tapped, meaning you shot 1 one and then it shot again, that was you not the rifle.
You got bitch slapped by a 308 and your finger set it off... we see this alot with people with poor trigger control.
Now, if you closed the bolt and it shot, my apologies, but if you shot 1, then "it" shot again, that was you. </div></div>
lowlight... no bitch slappin, i was loading each round individually without a mag, had the rifle pointed to the side, @ the ground with the bolt locked open, put a round in the pipe, hit the bolt catch and boom...
Re: MK11 MOD 0... slamfire...
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: skinney</div><div class="ubbcode-body">[snip]
lowlight... no bitch slappin, i was loading each round individually without a mag, had the rifle pointed to the side, @ the ground with the bolt locked open, put a round in the pipe, hit the bolt catch and boom... </div></div>
Umm, HIGHLY not recommended with semi-autos.
The "conventional wisdom" for a couple of decades or more is that semiautos are *designed* to feed from a magazine. Without the little bit of drag of sliding past the feed lips and up the ramp and so forth is considered improper.
Now, in my opinion, that's a bogus argument. Since one of the "field expedients" for using a semiauto even without a magazine is single-loading, I personally and professionally believe that any semiauto should be designed to safely operate under that foreseeable level of "abuse". After all, don't we also want them to be "safe" even when dropped from 10 feet onto a concrete surface?
But in some circles, and perhaps most, the feeding method you describe could be called "bitxx slapping" the ammo. It is certainly the UN-recommended way to single-load an M1 Garand or an M1A. I myself let the bolt go from about the halfway forward if the round is already chambered. I'm just a bit careful that way.
BTW, I have a similar opinion of the alleged "abuse" of M1911 pistols through chambering a round and letting the extractor snap over the rim, rather than the "proper" way of using a "Barney" magazine to feed so the rim slips under the extractor. If a pistol cannot handle snapping over the rim, then the design and/or materials are NOT up to snuff.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: skinney</div><div class="ubbcode-body">[snip]
lowlight... no bitch slappin, i was loading each round individually without a mag, had the rifle pointed to the side, @ the ground with the bolt locked open, put a round in the pipe, hit the bolt catch and boom... </div></div>
Umm, HIGHLY not recommended with semi-autos.
The "conventional wisdom" for a couple of decades or more is that semiautos are *designed* to feed from a magazine. Without the little bit of drag of sliding past the feed lips and up the ramp and so forth is considered improper.
Now, in my opinion, that's a bogus argument. Since one of the "field expedients" for using a semiauto even without a magazine is single-loading, I personally and professionally believe that any semiauto should be designed to safely operate under that foreseeable level of "abuse". After all, don't we also want them to be "safe" even when dropped from 10 feet onto a concrete surface?
But in some circles, and perhaps most, the feeding method you describe could be called "bitxx slapping" the ammo. It is certainly the UN-recommended way to single-load an M1 Garand or an M1A. I myself let the bolt go from about the halfway forward if the round is already chambered. I'm just a bit careful that way.
BTW, I have a similar opinion of the alleged "abuse" of M1911 pistols through chambering a round and letting the extractor snap over the rim, rather than the "proper" way of using a "Barney" magazine to feed so the rim slips under the extractor. If a pistol cannot handle snapping over the rim, then the design and/or materials are NOT up to snuff.
Re: MK11 MOD 0... slamfire...
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Grump</div><div class="ubbcode-body">Now, in my opinion, that's a bogus argument. Since one of the "field expedients" for using a semiauto even without a magazine is single-loading, I personally and professionally believe that any semiauto should be designed to safely operate under that foreseeable level of "abuse". After all, don't we also want them to be "safe" even when dropped from 10 feet onto a concrete surface? </div></div>
as is this my opinion... i have loaded my armalite super sass like this many times when chronographing rounds, or when having a mag issue or dirty upper, i usually guide the bolt about 1/4 of the way befor i let her snap, but when you shoot suppressed your upper gets dirty, you and i know how semi autos perform with no forward assist when they are dirty, and you need the round chambered... you pull the charge handle all the way back and let her rip, cause if you don't, the round don't always go... like i said, i have heard of this happening with the SR-25 so i was aware of the issue.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Grump</div><div class="ubbcode-body">Now, in my opinion, that's a bogus argument. Since one of the "field expedients" for using a semiauto even without a magazine is single-loading, I personally and professionally believe that any semiauto should be designed to safely operate under that foreseeable level of "abuse". After all, don't we also want them to be "safe" even when dropped from 10 feet onto a concrete surface? </div></div>
as is this my opinion... i have loaded my armalite super sass like this many times when chronographing rounds, or when having a mag issue or dirty upper, i usually guide the bolt about 1/4 of the way befor i let her snap, but when you shoot suppressed your upper gets dirty, you and i know how semi autos perform with no forward assist when they are dirty, and you need the round chambered... you pull the charge handle all the way back and let her rip, cause if you don't, the round don't always go... like i said, i have heard of this happening with the SR-25 so i was aware of the issue.
Re: MK11 MOD 0... slamfire...
Do you use a small-base sizing die? Semiautos with tighter tolerance chambers do not take kindly to brass prior-fired in fat chambers and neck-only or full-length re-sized in generous ("Looser") dies.
Do you use a small-base sizing die? Semiautos with tighter tolerance chambers do not take kindly to brass prior-fired in fat chambers and neck-only or full-length re-sized in generous ("Looser") dies.
Re: MK11 MOD 0... slamfire...
sinister, i'm using the RCBS FL resizing die (don't believe its small base), i tumble/polish all my 308 brass, got to... shootin with a can.
sinister, i'm using the RCBS FL resizing die (don't believe its small base), i tumble/polish all my 308 brass, got to... shootin with a can.
Re: MK11 MOD 0... slamfire...
I have seen it many times of semi autos slam firing in the way you described by just dropping one in, even on an AR one time, and it was an AR10. Several times on M1's and one of them had to go to the hospital to have shrapnel removed from his shoulder cause the bolt came apart.
Load it from the mag and you won't have any issues
I have seen it many times of semi autos slam firing in the way you described by just dropping one in, even on an AR one time, and it was an AR10. Several times on M1's and one of them had to go to the hospital to have shrapnel removed from his shoulder cause the bolt came apart.
Load it from the mag and you won't have any issues
Re: MK11 MOD 0... slamfire...
Did you check the firing pin and inside the bolt and carrier for debre and carbon or if the firing pin is to tight in the carrier?
Did you check the firing pin and inside the bolt and carrier for debre and carbon or if the firing pin is to tight in the carrier?
Re: MK11 MOD 0... slamfire...
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Hogstooth</div><div class="ubbcode-body">I have seen it many times of semi autos slam firing in the way you described by just dropping one in, even on an AR one time, and it was an AR10. Several times on M1's and one of them had to go to the hospital to have shrapnel removed from his shoulder cause the bolt came apart.
Load it from the mag and you won't have any issues </div></div>
This could be it also, bolt does not slow down like when the bullet is getting stripped out of the mag. AR10s have a heavy pin, lot more kinetic energy that the primer has to withstand. I get dents in the primer from my ARs even when I chamber a round from a mag. I noticed even larger dents in the primers with my LMT MWS.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Hogstooth</div><div class="ubbcode-body">I have seen it many times of semi autos slam firing in the way you described by just dropping one in, even on an AR one time, and it was an AR10. Several times on M1's and one of them had to go to the hospital to have shrapnel removed from his shoulder cause the bolt came apart.
Load it from the mag and you won't have any issues </div></div>
This could be it also, bolt does not slow down like when the bullet is getting stripped out of the mag. AR10s have a heavy pin, lot more kinetic energy that the primer has to withstand. I get dents in the primer from my ARs even when I chamber a round from a mag. I noticed even larger dents in the primers with my LMT MWS.
Re: MK11 MOD 0... slamfire...
Skinney,
Are you the original owner of this MK 11? Perhaps the recoil spring has been replaced with a heavier spring. Also I would remove the recoil buffer and confirm that it is a lightweight match buffer. If all else fails contact KAC and consult with them. I have a MK 11 and have fed her nothing but match ammo and handloads and have never had a problem.
Johnny
Skinney,
Are you the original owner of this MK 11? Perhaps the recoil spring has been replaced with a heavier spring. Also I would remove the recoil buffer and confirm that it is a lightweight match buffer. If all else fails contact KAC and consult with them. I have a MK 11 and have fed her nothing but match ammo and handloads and have never had a problem.
Johnny
