April 5, 2026 ar-15 gunsmithing build

AR-15 parts are everywhere. The barrier to buying a lower, an upper, and a parts kit has never been lower, and YouTube will walk you through the assembly. So why pay a gunsmith to do it? Because there's a difference between assembled and built. I've had plenty of rifles come through the bench that technically went together but had headspace issues, improperly staked carrier keys, BCGs that weren't timed right, or castle nuts that were never staked. Those rifles will run — until they don't.

Headspace is the first thing I check on any AR that comes off a build. It's the measurement between the bolt face and the chamber, and it has to fall within SAAMI spec or you're either getting failures to feed or you're running a chamber that's too loose and could eventually cause a case rupture. Checking it takes a go-gauge and a no-go gauge — two tools that most home builders don't own. If headspace is right, great. If it isn't, we're either getting a different barrel or fitting it properly before this rifle fires live ammunition.

From there: carrier key staking, which locks the gas key screws in place so they don't back out under heat and recoil; muzzle device timing, so the flash hider or comp is indexed correctly and torqued to spec with a crush washer that's properly compressed; and trigger fit, making sure the disconnector is functioning cleanly and the pull weight is within a reasonable range. I test-fire every build before it leaves the shop — five rounds minimum, checking for consistent ejection pattern and cycling function.

If you've got a pile of parts sitting in a box and you want them turned into something you'd trust your life to, bring them in. I'll assess what you've got, quote the build, and give you back a rifle that's been checked at every step. Fort Scott is central to a lot of southeast Kansas — if you're coming from Chanute, Iola, or across the line in Nevada, it's worth the drive to get it done right.