Suppressors Surefire rumor or truth?

[jaycoux]

I heard that surefire had changed their baffles which decreased further the amount of backpressure. Any truth to this?? My obr will short-stroke each time while the gas block is set to 'supressed'. I'm running a 762SS on a 16" obr.
It also shifted my poi about 4 inches down as well. No baffle strikes I could see.

J

 

[rwest309]

Re: Surefire rumor or truth?

I dont know but I would love to hear the answer. I also run a 762ss on an 18 inch obr and it wont run for shit with the switch in suppressed mode. It functions fine with it switched to un suppressed though. My dads 762K does the exact same thing. Both our guns were pre-XTRAXN guns.

 

[jaycoux]

Re: Surefire rumor or truth?

Good to hear that I'm not the only one. I have one pre- and one post-xtraxn. Do you remember when you ran the switch on supressed if you got a poi change?

Did you ask the folks at larue their thoughts?

I haven't tried the switch in normal mode with the suppressor yet.

J

 

[m1ajunkie]

Re: Surefire rumor or truth?

I'm not sure about the cycling problems you are having with the suppressed setting on the obr, but your poi shift is a bit odd to me.

I am running my 762ss on 2 barrels for my lmt mws, one in .308 and one in 6.5cm. Both barrels have much less poi shift, the .308 moves right at 1" to the 1 o clock at 100yds, and the 6.5 roughly 2/3" to the 10 o clock at 100yds. Might be worth finding member "chucky" on here as he is a surefire rep and has been much help to me getting everything squared away.

 

[jaycoux]

Re: Surefire rumor or truth?

Done. Thanks for the info...

 

[sic65stang]

Re: Surefire rumor or truth?

I had this issue with my GAP 10 and my 762ss with the switchblock also. After some tweaking of my positioning, ensuring I had the rifle firmly seated into my shoulder fixed my problem. Also my rifle needed to be ran very wet for the first couple hundred rounds, especially suppressed, not sure how many you have through it.

This will still happen occasionally to me.

 

[rwest309]

Re: Surefire rumor or truth?

I will have to try that. I have roughly 200 rounds through the OBR maybe less. I wouldnt say I run it wet but it is lubricated. I will also try a hard hold. It works fantastic in unsuppressed mode with the can so I havent really given it much thought.

 

[rwest309]

Re: Surefire rumor or truth?

I will have to try that. I have roughly 200 rounds through the OBR maybe less. I wouldnt say I run it wet but it is lubricated. I will also try a hard hold. It works fantastic in unsuppressed mode with the can so I havent really given it much thought.

 

[Arbiter]

Re: Surefire rumor or truth?

Maybe I'm dumb, but it seems to me like a lot of people keep placing all of the blame for POI shift onto the suppressor or the mount...instead of looking at the damn barrel of the rifle and asking "Is this a long, skinny pipe that's going to move dramatically when weight gets added to the end, or a short stubby piece of steel that's going to ignore whatever I hang on it?"

If resting my rifle barrel on an obstacle rather than using the fore-end for contact results in an upwards shift of a minute or two, then why wouldn't the downward force of gravity on a can result in a similar shift?

 

[jaycoux]

Re: Surefire rumor or truth?

Well, When you have a company that touts it's suppressors as minimal POI shift.....

Having said that, I completely agree. There is no reason to believe that any suppressor will produce no shift. It's a simple physics problem.

Here is an update to my original post. My rifle went back to Larue and I was told that when they developed the adjustable gas block for the OBR it was designed to work with a K series suppressor. Apparently the SS doesn't produce as much back-pressure. Their solution was to run a green spring in my gun and to leave the selector on unsuppressed all the time. This way it functioned perfectly both suppressed an not suppressed and didn't beat up the components when shooting suppressed.

I will find out for sure tomorrow when I get it back and shoot my own loads.

j

 

[KYS]

Re: Surefire rumor or truth?

This is the exact reason why you cant sell a commercial gas block. They all take tuning. When the Noveske switch block was introduced to the GAP10, I took the suppressor to them and the ports were drilled out for that suppressor. I run a SF 762SS and it function perfectly.

You have to tune those gas blocks!

 

[springer01]

Re: Surefire rumor or truth?

Never had a problem with my POF and AAC SDN-6 and its been shot suppressed its whole life.