300 AAC Blackout upper

[Dr.Rob]

Model One took SEVEN MONTHS to get all my parts together, but they did not raise prices.

While the market has rebounded somewhat, not all parts are sitting on a shelf ready and waiting.

 

[justice06rr]

My personal suggestion is to build your own 300BLK upper instead if you are looking to save a little money. Barrels can be bought for $140 at SOTA, and $60 for an upper receiver from AeroPrecision. add handguard and other upper parts and you should be within the same price range.

 

[docsleepy]

I've never checked headspace on a semi, but I'm very familiar with checking it on Savage builds. From watching a youtube, it isn't that difficult. Removing extractor and ejector makes it possible "feel" more easily.

I usually take a go-gage, verify that I can close the bolt, and then one can build up the go-gauge to be a no-go by adding layers of skotch tape (about .003 each). I went and checked the SAAMI spec .223 chamber and the difference between min and max chamber "headspace" is .010 -- or about three thicknesses of tape on a gogauge I estimate.

Not hard to do, probably takes about 30 minutes and would make me personally feel a lot happier about shooting thousands of rounds through a firearm I had assembled.

It certainly makes some sense to start the other way round with a field gauge, but I like my bolt guns a bit toward the tight side. A semi, maybe it is better to have it a bit toward the loose side to guarantee everything will chamber. I'm not an expert on that.