You guys know the head space on an AR is set when the barrel extension is installed by the barrel manufacturer, right? The tools required to assemble an upper will cost about $100. If you are reasonably mechanically inclined, you can do it with the procedures you find on the internet. There is the military m-16 manual and loads of youtubes on it. If you are worried about headspace, you can get matched bolts and barrels from shilen and others. Krieger will headspace a barrel on your bolt if you mail it to them. But the fact is, the parts are standardized, I have never had more than 2 thousandths variance in headspace in my AR's. Headspace gauges are about $20 a pop and you need 2 or a go and some tape. Or you can assemble your upper and have a gunsmith check it for you. You just need to decide whats best for you; the pride of having built your upper or the pride of having a expensive brand name upper.
long time lurker, just a couple a post, built a couple of AR's but am really intrigued with the threads on AR15 pistols. noticed alot of the threads died a few months ago. was wondering if anyone has ever built one with the magazine welded to the lower. if so if ya got pictures of it? i've seen suka's build but i'd like one that looks more like an SBR with pistol buffer tube etc. if its at all possible to have one like that in hawaii it'll be my next build for sure. ill get some pics of my latest build up as soon as i have the time.thanksin advanced for any info.
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