jjl103
3 February 2014, 11:58
I posted my AR build in the stickied thread, but just got around to shooting it a good bit this past weekend. I splurged on a 500 rnd case at our local gun store, so I ended up putting 150 of the cheap AR225 black boxes through it. I was pretty impressed with how controllable it was (just over 8lbs loaded with a 30rnd PMAG). There was definitely a noticeable difference between the Surefire MB556k and the regular A2. My MBUS Pro sights were pretty easy to get zeroed in, and the Vortex Sparc stayed zeroed despite somewhat banging it around.
I did encounter a couple of issues. I mentioned on my last post that I took some shortcuts on the buffer kit (cheap ATI), and I definitely noticed the difference. My STR stock had for some reason been pushed all the way forward (i had it taken apart prior to shooting it), and I didn't think to check the length on my first shot. 3 shots later, I noticed it was too far forward, but when I went to adjust it, I noticed the STR had gotten stuck on the rigid threads of the ATI Buffer Tube. I spent an hour of my time pulling on it and prying it off, finally getting it free. Its flaw is that the threads weren't tapered, they just end. Quality tubes would have a taper or sanding down, to fade them so stocks don't get stuck. I even noticed this craftsmanship on the PSA tube my friend was running. Needless to say, I purchased a new kit that shipped out today.
I found that I had only 1 failure to eject out of the 150 rounds of brass I shot (last round in my 2nd magazine didn't eject or hold the bolt open, however I couldn't repeat the results in the remaining 3 mags). I also tried a box of Tula Ammo, which did not function at all in my gun. I experienced failure to feeds, failure to ejects, and double feeds. The failure to eject happened every other round. I got a failure to feed probably every 5 rounds, and I experienced 2 double feeds as well. This was out of just 1 box of 20. Definitely think this has something to do with the 14.5" Midlength not liking the under pressured rounds, as I tried my friend's upper (16" middy) on my lower and it worked without a flaw.
Other than that, it functioned fine and I was able to shoot 1 MOA groups from 25m out with the Vortex Sparc, which I think is a definite win.
I did encounter a couple of issues. I mentioned on my last post that I took some shortcuts on the buffer kit (cheap ATI), and I definitely noticed the difference. My STR stock had for some reason been pushed all the way forward (i had it taken apart prior to shooting it), and I didn't think to check the length on my first shot. 3 shots later, I noticed it was too far forward, but when I went to adjust it, I noticed the STR had gotten stuck on the rigid threads of the ATI Buffer Tube. I spent an hour of my time pulling on it and prying it off, finally getting it free. Its flaw is that the threads weren't tapered, they just end. Quality tubes would have a taper or sanding down, to fade them so stocks don't get stuck. I even noticed this craftsmanship on the PSA tube my friend was running. Needless to say, I purchased a new kit that shipped out today.
I found that I had only 1 failure to eject out of the 150 rounds of brass I shot (last round in my 2nd magazine didn't eject or hold the bolt open, however I couldn't repeat the results in the remaining 3 mags). I also tried a box of Tula Ammo, which did not function at all in my gun. I experienced failure to feeds, failure to ejects, and double feeds. The failure to eject happened every other round. I got a failure to feed probably every 5 rounds, and I experienced 2 double feeds as well. This was out of just 1 box of 20. Definitely think this has something to do with the 14.5" Midlength not liking the under pressured rounds, as I tried my friend's upper (16" middy) on my lower and it worked without a flaw.
Other than that, it functioned fine and I was able to shoot 1 MOA groups from 25m out with the Vortex Sparc, which I think is a definite win.