Some things I’ve been working on…thought I’d share
MK12 Mod 1
[ul]18" special contour stainless barrel
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[ul]Rifle length gas
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[ul]OPS INC brake/adapter for 12th model suppressor
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[ul]KAC RAS rail
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[ul]KAC bipod adapter
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[ul]Harris 6-9 bipod
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[ul]KAC 11 rib panels
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[ul]LMT complete BCG
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[ul]PRI Gasbuster charging handle
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[ul]Nightforce NXS 2.5-10x32
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[ul]La Rue LT104 cantilever mount
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Goal here was to set up a SPR in the same caliber as my other guns.
I could not be happier with the setup so far. Kevin at HCS is one of the best people to work with, would reccomend him and Alan to anyone out there looking for a MK12 or 18. Kevin and I talked through it and I was a bit worried about the A5 and problems cycling but all brass 55gr-77gr of various manufacture have all functioned perfectly.
9.3lbs unloaded
150 rounds SWA 5.56 77gr
0 issues
200 rounds Federal 223 55gr
0 issues
100 rounds M855
0 issues
12" SBR
[ul]PSA 12" upper, FN rollmarked barrel, 4150, 1/7 twist, F marked FSB
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[ul]Carbine length gas system
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[ul]~.067" gas port
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[ul]Centurion C4 carbine cutout rail
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[ul]Magpul RVG
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[ul]BCM complete BCG
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[ul]GI charging handle
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[ul]Daniel Defense 1.5 rear sight
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[ul]Aimpoint Comp M + Larue mount (in the mail)
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[ul]PSA stripped lower
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[ul]G&R tactical LPK
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[ul]BAD ASS ambi safety
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[ul]VLTOR A5
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[ul]VLTOR emod
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[ul]Magpul MOE grip
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[ul]Vickers padded sling with QD
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[ul]Rustoleum camo job
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Goal here was to two-fold; first was to build an SBR that is the ‘perfect’ mix of weight savings, terminal ballistics, reliability, accuracy, etc. The second was to give PSA a try. They caught my eye with their specs, the FN-manufactured barrel, the barrel length, and finally the price tag. After confirming things like chamber and gas port, I was comfortable going ahead with the SBRing process. Keep in mind, there is no mil spec for this barrel length.
This was my first business with PSA and I have been completely satisfied. Not sure if they make this upper anymore, or even have the barrels, but the combo makes for a very smooth-cycling SBR that is both light and manageable. With the VLTOR emod this is perfectly balanced at the magwell ~T11, which I like given that no matter how full/empty the magazine, feel and balance are the same. Only downside to the SBR is that it will not reliably function steel.
5.2lbs unloaded
300 rounds federal 55gr 223
0 issues
20 rounds Tula steel 55gr 223
5 FTFs attributed to short-stroking
Take-aways from both builds
*The VLTOR A5 is the shit. Seriously. Its functional advantages and dynamic ability to provide benefits across various barrel lengths make it a must have for anyone that has a lower playing host to more than one upper.
*Like the A5, I’m hooked on the emod. The cheekweld, integral sling attachment point, and the way it effectively balances a 11.5-18" upper is great. I may have to try an imod on the next (MK18) build due to weight.
*Centurion rails are the shit. Easy install and 4 integral QD points are the high points for me.
*Along with Centurion, Battle Arms Development is one of my favorite companies, both in terms of doing business and in terms of their product/ingenuity.
*I don’t like the selectors PSA provides with their LPKs - very gritty and difficult to actuate especially on the first couple range trips (even with a polished detent). Swapped out for LMT selector from Grant.
