What is going on with this dang gun, it is constantly jamming the next round at an angle. They are 125 grain sst loaded with 18.5 g H110, 2.1 col averaging 2248 fps. Load it in singles and it locks back every time. It cycles the subsonics just fine. I don’t know what to try. Thanks in advance.
- Thread starter Crankinsparky
- Start date
- Nov 3, 2010
- 8,667
- 17,615
Bad mag or fucked up feed ramps. Details details details
I tried several different mags, pmags, metal mags and sig mags. The feed ramps don’t look like there is any damage or anything out of the normal. It worked fine and then all of a sudden the last 2 times I was out it has done this
- Nov 3, 2010
- 8,667
- 17,615
Rounds hitting the ribs in the mags? Pushing them off center? You said it works when you single load. Have you tried just two or three
I have tried a few rounds, full mag, half mag. Sometimes it work for a few rounds, every now and then it works for most of a mag but mostly after a couple of shots it does it every time
- Nov 3, 2010
- 8,667
- 17,615
Just making sure these are specific 300 blackout mags, yes?
Since it locks back and functions fine with subs we can probably rule out undergassing. But overgassing can cause bolt over cartridge malfunctions if the BCG speed is higher than the mag can feed, and obviously would only be a problem with supers, especially if the gun is biased towards optimal gassing with subs.
It’s an aac 16” upper sitting on a rock river lower with a dead air L suppressor all stock except trigger
The mags are just pmags 223/300 except the one sig mag is for a 300.
How would I know if it was over gassed or even how would I fix it
How would I know if it was over gassed or even how would I fix it
The mags are just pmags 223/300 except the one sig mag is for a 300.
How would I know if it was over gassed or even how would I fix
How would I know if it was over gassed or even how would I fix
Sorry that was and accident.
So just now I tried an h3 buffer and whaat seemed like a mile long spring and it made it through almost a whole mag and jammed again on the second to last round. Still cycled a whole mag of subs and locked back on the last round
So just now I tried an h3 buffer and whaat seemed like a mile long spring and it made it through almost a whole mag and jammed again on the second to last round. Still cycled a whole mag of subs and locked back on the last round
Where are your empty cases landing?
Behind me at about 5 o’clock
Would a different bolt do anything or are they pretty much the same
I don’t think it’s pistol length. Is there a measurement
Ok yeah it’s carbine length
Is there a way to lower the gas without like an adjustable gas block. Sorry I am a bolt action guy and this is my pig gun so I don’t know much about it.
Ok, I got the gas pressure down and it is back running like a charm. Thanks for the help.
Adjustable gas block is easiest, otherwise there are adjustable gas keys, adjustable BCG's, gas block or tubes with undersized ports or switchable inserts, or you can just give the excess gas more work to do with heavier springs and/or buffers.
Good deal. How did you go about it?
I picked up a cheap adjustable gas block for the gun shop. It took me awhile to figure it out but works good now.
