Most of my SBR’s wear a RDS, but I’ve thrown an ACOG on them with MOA shooting. My Colt 10.3 , 6945 is a MOA gun. I would go for SIONICS. I might try a few this Sunday and see what we can do.
PB
Most of my SBR’s wear a RDS, but I’ve thrown an ACOG on them with MOA shooting. My Colt 10.3 , 6945 is a MOA gun. I would go for SIONICS. I might try a few this Sunday and see what we can do.
PB
"Air Force / Policeman / Fireman / Man of God / Friend of mine / R.I.P. Steve Lamy"
Best bang for the buck is probably the Larue Stealth Barrel in 12". I have a 16" that is a laser, a little heavy but has repeatable shot 1/2 moa if I do my part.
Short barrels are generally as/more accurate than longer barrels, up to their velocity-limited/bullet stability range. (Harmonics, flex, etc.) Here are a few examples of what I consider real-world, practical accuracy. Keep in mind the 10 rd groups, the low/no magnification optic, the rest (magazine, bipod, etc.), the ammo, and, of course, the shooter. **The tgt labeled "prone unsupported" is inaccurate. I was resting on the magazine.**
The first is a DD chrome-lined gov't profile barrel cut to 10.75". M4SDII, BCM lower, Aero forged upper, Larue MBT trigger.
These are representative groups for this barrel, not hand-picked anomalies. I have several 10rd groups of Wolf Gold that are 1.5-1.6", but this set up will not do that every time.
Note the POIs for each ammo type. All groups were fired with the same zero. Interesting that some very different ammo types have the same/very similar zero @ 100. Others, of course, are quite different (see next post.)
>>In response to several inquiries: Yes, in my limited testing of 5 rd groups, the group size is notably smaller<<
Last edited by MQ105; 05-30-18 at 12:33.
This is a Sionics 11.5. BCM upper, same suppressor and lower as previous post. 4x optic. These are representative groups for this barrel, not hand-picked anomalies.
As a side note, I haven't found the Mk318 to be accurate from any barrel I have tried. Keep in mind that my lot is seconds and a sample size of one.
Last edited by MQ105; 05-30-18 at 12:04.
@mq105 - wow thanks for the groups. That is some valuable data.
I had an upper that absolutely hated 69gr and up. Looked like your groups on the MK318. Was sub moa on 55gr though. Supposedly 1/8 twist but I suspect it was closer to 1/9
Seems like the Sionics is a bit more picky in 11.5
The DD 10.5 seems to like the heavier rounds but does OK with 55gr too.
I am down to these barrels:
TriArc 12.5 (mid length) (unknown gas port) $260
Sionics RGP 11.5 (carbine) (.070 ?) $200
Daniel Defense 12.5 (carbine) (.0595 per Brownells which seems super small?) $275
Centurion Arms 12.5 LW (carbine) (.070?) $330
These are all around 1.4 lbs give or take .1lbs
but the Centurion Arms is lightest at 1lb 5.1oz which is about 2oz lighter.
But sub moa with 77gr is priority, then gas port though I will be using an SLR7 adjustable block
I really don't measure or shoot for groups with my short guns but I had a DD 12.5 barrel and shot it out after about 16K rounds (some in full auto). I replaced it with a Noveske 12.5 barrel and it is significantly more accurate and less gassy.
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