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Had a nice time sighting in / function testing a couple of my newer AR’s at the range the other day. I typically shoot on private land but bench shooting is a good way to get your guns out, put some rounds through them and make sure they are running good. For the most part there were no issues but any AR builder will tell you it only takes one small issue to throw a monkey wrench in there.

620 CIV Tactical SPR AERO Precision AR Pistol Vortex opticsClick to enlarge

The rifle has an upper built by CIV Tactical using receivers are from Tactical Firearms Solutions. CIV Tactical used their excellent 18″ SPR barrel and Matched Bolt that are known for getting some extremely low sub-MOA results. I used an older Bolt Carrier with the supplied bolt and figured everything would be fine. When the rifle wouldn’t eject a single round I knew there was something going on. Instead of just giving up and using the other AR I brought I decided to try to figure out was the issue was. After trying 2 different lowers, 4 different mags and 2 different types of ammo I decided to try a different BCG. Swapped it out and it ran like a Sewing Machine. I know the Matched Bolt is good as it was test fired with that exact Bolt so it’s pretty obvious I can narrow it down to the Bolt Carrier such as a leaky Gas Key. Looks like I threw in my own monkey wrench.  LoL  

The point is if you think logically through your failures and start eliminating possible issues, you can quite often move past the issues with the rifle and still get in some good trigger time. Oh, and bring some tools and small parts with you when test firing a rifle for the first time.  🙂

The rail on the SPR is a Parallax Tactical FFSSR rail. It also has an ATLAS Bipod with ADM mouth and the Stock is the LUTH-AR MBA-1 that you can buy from www.MidwestPX.com. The AR Pistol is all AERO Precision with an Odin Works 10.5″ Barrel, Primary Weapons CQB comp and a KAK Industry Super Sig Tube. Both guns have Vortex Optics…optics.

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