About a year ago, I scraped my "varmint" shooting rig because of its weight. I had in my mind what I wanted to build, but couldn't find the right parts to make it work. Partially because what I wanted wasn't on the market yet.
Going off the success of my main training gun (https://www.m4carbine.net/showthread...ght=suppressed), I wanted to build a 16" AR that was dedicated for suppressed use, BUT could also have full functionality for when I take it to States where I don't want to bring my suppressor. The question was, how to do it??? The Noveske SB was of course an option, but I wanted a longer rail so that was out. At a stopping point, I happened to be reading the GearScout blog and saw the SYRAC Gas Block. Some years ago, a friend and I built this exact same setup, but ours had a side wheel that adjusted the screw covering the gas hole. We ran into a problem in that we couldn't find a way to keep the "wheel" from rotating (needed a detent lock on it). So when I spotted the SYRAC Defense GB, I knew that someone else had answered the question and built what I needed to complete my build!
Selection of parts.
Wanting a gun that would shoot under 1MOA at 100yds, I selected the BCM SS barrel. We then used our own G&R Tactical BCG and fitted a bolt to the barrel.
Having already installed the new Noveske NSR rail to my 10.5 gun, I knew that I wanted this rail system on my varmint gun. The NSR rail provides an anti-rotation system if used in conjunction with the Noveske/VLTOR MUR upper receiver so that was a no brainer.
At this years shot show, I was at the Lancer booth ordering mags when I noticed their lower. I was familiar with this lower from years past, but also knew that it was rude money (as it was billet). That's when they informed me that this was their new one and was a forging (which was much cheaper). Hmmm, looks nice and I like the enlarged mag release and bolt release on the right side of the gun. So I selected one with the standard magwell adaptor and waited. And waited. And waited some more. Finally they came in and I built it using our LPK's and the Geissele SD-C FCG.
For glass, I went with the Vortex Optics 1-4 HD. Quality optic with great glass that won't break the bank.
After zeroing the gun, shot for group using BH's 77gr MK's. Unfortunately, it started to rain and had to hurry up my shooting. I did manage two shoot two 5rd groups at 100yds though. The first group was 1" and the second one was around .75. I quite honestly believe that if I was using a bit more powerful scope and it wasn't raining that the gun could have produced .5" groups. Not bad for an autoloader using factory ammo!
Calibration of the SYRAC GB was pretty easy. I started out near the factory set position and then fired one round (empty mag) WITHOUT the suppressor on to see if the bolt would lock back. Then I would depress the detent through the rail (which the NSR is setup well for this as it has side slots that allow for easy access) and turn the screw one full revolution. Fired for affect until the bolt WOULDN'T lock back. Once set, I put the suppressor on the gun and fired one round to see if the bolt WOULD lock back.
On a 16" middy, the screw on the GB needed to be nearly flush with the end of the GB in order for the bolt to not lock back on the last round (without the suppressor on it).
Parts list:
Upper
Noveske/VLTUR MUR
BCM 16" SS barrel
Noveske 13" NSR Rail
G&R Tactical BCG
BCM GunFighter CH (MOD 4)
KAC 300M BUIS
Magpul MBUS 2 Front
SureFire FH 212A
SYRAC Defense Adjustable GB
Lower
Lancer (forged) lower
G&R Tactical LPK
Geissele SD-C
LMT Receiver Extension
LMT Castle Nut
G&R Tactical H buffer
Tactical Spring Co buffer spring (blue)
Magpul MOE Plus Grip
LMT SOPMOD
Novese QD Receiver plate
C4
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Originally Posted by munch520
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