Aug 25, 2014

A few build notes

Regarding the AR pistol build from my last post, a few things that are worth mentioning:

- The PSA Pistol Lower Build Kit had an oversized bolt-catch roll pin that necessitated ordering a new pin after I mangled the first one. The trigger, however, is surprisingly good for a budget parts kit. It's no Geissele, but it's a tolerable single-stage.
- The AR small parts kit from Amazon is worth every penny and also included extractor O-rings (which are not pictured).
- The AIM Surplus NiB v2 bolt group is on par with the WMD bolt I have in another rifle, and $50 cheaper. The non-v2 version isn't quite as nicely finished but quite functional and another $30 less.
- The Brownell's upper receiver block is a great fit and will do both A2 and flat-top uppers. (Bought secondhand.)
- The Diamondhead VRS-T handguard is the cat's ass, but requires a low-profile gas block. Also, the barrel nut, while nice because it doesn't need timing to the gas tube, needs a 1-1/4" wrench to install. If you're going to torque to spec, get a crowfoot wrench. I didn't, I just got a big honkin' box wrench from Home Depot and cranked it down to "that's snug".
- The Kaw Valley Precision Linear Comp is a beautiful little piece of equipment and very fairly priced. Sure beats three times the price for a Noveske KX-3/-5.
- AR barrel nuts require a moly grease for installation. There are reasons not to use plain old bearing grease, something about graphite and dissimilar metals. You can buy an entire tube of AeroShell 33MS grease (meets the military spec) for $15-20 and have enough grease for a lifetime, or a 2oz tub of KG-11 Moly Grease for $18 and still have enough for lifetime. Note: this shit gets everywhere. Wear old clothes, put down newspaper, paper plates, whatever, and still expect to get some where you don't want it.
- CLP in a needle applicator is fantastic for small-parts assembly. And for $5, get a tube on your next Amazon order. Tip of the hat to Carteach for the original recommendation on that.
- A Primary Arms MicroDot/Fortis Mount combo is on the way to me. It's light, battery-efficient, and not terribly expensive. Also a plus, the mount is compatible with Aimpoint Micros if/when I decide to upgrade.

(All links are to where I sourced the parts for this build. It seems that several of them have gone out of stock since I ordered, which means either I got the last one or it's just that popular.)

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