It's undergassed. An 11.5" should be around .076. I think I mentioned this when you contemplated sending it out for the Caitlyn remake. If you are shooting it suppressed, that size will be fine even with .223.
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It's undergassed. An 11.5" should be around .076. I think I mentioned this when you contemplated sending it out for the Caitlyn remake. If you are shooting it suppressed, that size will be fine even with .223.
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Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com
If it were my gun I would switch it to an A5 system and start with an A5H2 buffer.
Steve
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I could have sworn you told me .073. Well that's probably the issue.
.076 then? Would you stick with the H3 buffer?
The barrel was cut so that the flash hider butts up against right where the m203 notch would normally start. I believe it's very close to 11.5".
Edit: just checked, you had previously told me .076, then corrected it to .073. But I can see about having it opened.
Last edited by masakari; 12-19-15 at 17:07.
I think the confusion was coming from the various other postings.
A 10.5" with a .071 port will work fine with MILSPEC (not .223) ammo suppressed and unsuppressed.
An 11.5" with a .076 port will work with 5.56 and most .223 ammo. Providing you don't over buffer it. Your .073 should work fine with .223 and the suppressor. Without the suppressor an H buffer and most likely an H2. Not an ST-2, an H2.
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Thanks. So, my options are:
Keep it at .073", H1 or maybe H2 buffer
Drill to .076", H2 or H3 buffer
Correct? Sorry, I'm just trying to plan things out. I already dropped the upper off to get drilled or tested with a new buffer. Busy schedule coming up, and all I have is the H3 to test with now. And of course, all the local shops are out of everything.
Last edited by masakari; 12-19-15 at 20:10.
If the port is opened to .076 which is the same size as my BCM 11.5" and the same size as the standard SIONICS it will work suppressed with an H3. In fact, before switching to the A5 several years back, my BCM 11.5" wouldn't lock back consistently with a suppressor and H2 buffer regardless of ammo. So I bumped it to the H3. Shortly afterwards went to the A5H4.
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The change in function between a .073" port to a .076" isn't large on a 11.5" 5.56.
With that port and base barrel, you should probably run an H2 or A5H2 with 5.56 pressure ammo without a can. You could step up to a heavier buffer with a can.
I personally would't ream the extra .003", I tend to like many 11.5" guns with a slightly smaller port than that.
Depending on ammunition with a standard carrier, an A5H3 may be more preferable without a can, depending on what that ammo is. The powder buffers do not perform as reliably in the M16 FOW as others.
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