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pacnw
Site Supporter
Location: Deer Park, Wa Joined: Sat Mar 19, 2016 Posts: 33
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Looking for suggestions and/or experience with this combination.
It's not going to be a daily shooter, more of a pdw with occasional practice/use.
Curiosity is if the long stroke will make a difference in barrel length restrictions and the fact it's adjustable gas.
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Fri Jun 24, 2016 4:45 am |
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MadPick
Site Admin
Location: Renton, WA Joined: Sun Mar 13, 2011 Posts: 52068
Real Name: Steve
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I guess I'm just not hip enough.
Are we talking about a 5.56 AR-15? Piston-driven? Made by Primary Weapons Systems?
_________________SteveBenefactor Life Member, National Rifle AssociationLife Member, Second Amendment FoundationPatriot & Life Member, Gun Owners of AmericaLife Member, Citizens Committee for the Right to Keep and Bear ArmsLegal Action Supporter, Firearms Policy CoalitionMember, NAGR/NFGRPlease support the organizations that support all of us.Leave it cleaner than you found it.
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Fri Jun 24, 2016 5:25 am |
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pacnw
Site Supporter
Location: Deer Park, Wa Joined: Sat Mar 19, 2016 Posts: 33
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MadPick wrote: I guess I'm just not hip enough.
Are we talking about a 5.56 AR-15? Piston-driven? Made by Primary Weapons Systems? Sorry, yes. Primary Weapons System MK107 (5.56). 7.75" barrel. Long stroke piston (similar to AK type). Thanks
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Fri Jun 24, 2016 7:09 am |
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1811GNR
Site Supporter
Location: East Renton Plateau Joined: Tue Jul 5, 2011 Posts: 914
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Barrel length restrictions won't be affected by operating system (piston in this case). So much more powder burning in the suppressor with the shorter barrel ya know. Best to find one that is warranted for that 7.5 inch barrel. I'm sure there are some that are but I can't recall which manufacturers. Could always build a Form 1 can and not have to worry about the warranty.
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Fri Jun 24, 2016 8:40 am |
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guncruiser
Site Supporter
Location: Seattle, Bellevue, Kirkland, Everett, Lynnwood at various times Joined: Sat Jun 21, 2014 Posts: 1668
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Silencerco Saker and Rugger Surge are both rated for 7" 5.56. You will need a 30 cal can. No 5.56 can to my knowledge is rated for a 7" barrel. That being said, if I wanted a 7" PDW, I would run 300BLK. 5.56 is notorious for baffle strikes. If you have to, run the Saker or the Surge with a 30 cal end cap.
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Tue Jun 28, 2016 7:36 pm |
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Mediumrarechicken
Location: Puyallup Joined: Thu Aug 16, 2012 Posts: 9065
Real Name: Richard Fitzwelliner
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guncruiser wrote: Silencerco Saker and Rugger Surge are both rated for 7" 5.56. You will need a 30 cal can. No 5.56 can to my knowledge is rated for a 7" barrel. That being said, if I wanted a 7" PDW, I would run 300BLK. 5.56 is notorious for baffle strikes. If you have to, run the Saker or the Surge with a 30 cal end cap. I'm confused. You're saying that baffle strikes are more common with 5.56 than 300 in a .30 can? I don't see how that's possible.
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Thu Jun 30, 2016 7:25 pm |
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chipster
Location: North Bend Joined: Mon Sep 10, 2012 Posts: 319
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you may want to read what he actually said which was...
5.56 is prone to baffle strikes (with a 5.56 can). Thus buy a 30 cal can which would reduce the chances of that. I run my 7" BLK with a GemTech 9mm Can (subs only) which is reasonable quiet and hedges on the off chance there are any issues stabilizing the bullet. you'll find that a 220(ish) grn 300blk at subsonic speeds has a much better chance stabilizing than a 5.56 at vastly supersonic speeds.
I did just talk to SIG about their 5.56 SRD can. They say they would warranty it on any commercially available length, so maybe an option here.
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Thu Jun 30, 2016 7:44 pm |
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BlDtyLry
Site Supporter
Location: Snohomish, WA Joined: Thu Jan 26, 2012 Posts: 1369
Real Name: Bo
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Dead Air Sandman has no minimum barrel lengths all the way up to 300Win Mag. Currently running a Sandman S on 8" 5.56 SBR and Saker 7.62 on 12.5" 308Win SBR. If i had to do it over again I would go with Sandman L rather than Saker 7.62.
_________________ "I don't know what it's called. I just know the sound it makes, when it takes a man's life." ~ Four Leaf Tayback
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Thu Jun 30, 2016 7:58 pm |
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guncruiser
Site Supporter
Location: Seattle, Bellevue, Kirkland, Everett, Lynnwood at various times Joined: Sat Jun 21, 2014 Posts: 1668
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chipster wrote: you may want to read what he actually said which was...
5.56 is prone to baffle strikes (with a 5.56 can). Thus buy a 30 cal can which would reduce the chances of that. I run my 7" BLK with a GemTech 9mm Can (subs only) which is reasonable quiet and hedges on the off chance there are any issues stabilizing the bullet. you'll find that a 220(ish) grn 300blk at subsonic speeds has a much better chance stabilizing than a 5.56 at vastly supersonic speeds.
I did just talk to SIG about their 5.56 SRD can. They say they would warranty it on any commercially available length, so maybe an option here. Correct. 5.56 with a 7" barrel doesn't stabilize well. A 5.56 projectile is much lighter than 300. About 3-4x lighter. Pressure also increases along an exponential (and not linear) curve with shorter barrels. 5.56 is over 17000 psi at 7", about 11500 psi at 10.5" and 8150 at 14.5" and that is hard on a suppressor. There is a bunch of anecdotal evidence with folks getting baffle strikes with < 10" with 5.56 with a 5.56 end cap. I would at least get a can which is rated for it with a good warranty and run a 30 cal endcap.
_________________Life Member, Second Amendment FoundationBenefactor, NRA
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Thu Jun 30, 2016 8:00 pm |
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usrifle
Site Supporter
Location: RENTON Joined: Fri Mar 25, 2011 Posts: 20771
Real Name: John
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I run a Specwar 7.62 can on my 5.56 SBR and it works great. Sound reduction is actually slightly better than the 5.56 can. Plenty of DB comparison tests on youtube, but mine is a 10.5" The specwar 7.62 is rated down to 7" on 5.56 and is also full auto rated.
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Thu Jun 30, 2016 8:29 pm |
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pacnw
Site Supporter
Location: Deer Park, Wa Joined: Sat Mar 19, 2016 Posts: 33
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Built a lower, attached the upper and fired a few rounds through it, 250-300.
Got the suppressor sooooo hot it caught the Silencerco suppressor removal tool, hot pad, on fire when I set it down on it! OOPS!!!!!!
It also permanently discolored the Saker 7.62 can!!!!
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Sat Jul 02, 2016 7:23 pm |
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Anthony.L
Location: Federal Way, WA Joined: Mon Dec 19, 2011 Posts: 230
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Both Dead Air and Surge label their cans with no min barrel restrictions, speaks to the toughness of their designs. SilencerCo you will need to go with the Saker line for that shot of barrel.
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Sun Jul 03, 2016 7:38 am |
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usrifle
Site Supporter
Location: RENTON Joined: Fri Mar 25, 2011 Posts: 20771
Real Name: John
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Anthony.L wrote: Both Dead Air and Surge label their cans with no min barrel restrictions, speaks to the toughness of their designs. SilencerCo you will need to go with the Saker line for that shot of barrel. The specwar 7.62 is rated down to 7" on 5.56
_________________ Mr. Q wrote: so basically, if you have to smoke some asshole, make sure they become fertilizer and then Bounce? got it.
Guntrader wrote: Huh, maybe I was an asshole.
NRA Member/RSO SAF 5 Year Donor GOA Member
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Sun Jul 03, 2016 9:00 am |
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