Mentoring : BLACK RIFLE

[sdbirddogs]

I can't say I really have ever built one from the ground up but I've put a few together that have turned out very nice and are great shooters. They were put together with Sundevil Billet Lowers, Gisselle triggers and Magpul PRS stocks. The Sundevil lowers have a poly set screw built in to tighten up the gap between the upper and lower. Works very well. The uppers have been White Oak .204 and .223 varmint uppers. Totals have run around $1700-$1800. All have been very accurate.

[RebelSquirrel]

The matched lower and upper means it will be extremely tight fitting when assembled, very close tolerances. You'd have to buy the upper and the lower from the same manufacturer if you want them "matched." Same principle as a matched 1911 slide and frame, the male and female portions of each are cut for one another and fit perfectly and tight.

[Larry in VA]

Understand, Thankyou.
Larry

[TonyRumore]

Originally Posted by RebelSquirrel

The matched lower and upper means it will be extremely tight fitting when assembled, very close tolerances. You'd have to buy the upper and the lower from the same manufacturer if you want them "matched." Same principle as a matched 1911 slide and frame, the male and female portions of each are cut for one another and fit perfectly and tight.

Well....sort of. Truth be known, it's actually better if the upper and lower are mis-matched a bit, so they don't actually pin up. That way, you can hand fit them for a perfect lock up. If the two holes line up dead-on, the upper and lower fit won't be very tight.

If you are buying a "matched" set, the manufacturer took a pair that was off, and hand fit them. Or they will sort through a bunch and test fit them, until they come up with a pair that fits correctly.

Tony

[TOU]

Originally Posted by TonyRumore

Well....sort of. Truth be known, it's actually better if the upper and lower are mis-matched a bit, so they don't actually pin up. That way, you can hand fit them for a perfect lock up. If the two holes line up dead-on, the upper and lower fit won't be very tight.

If you are buying a "matched" set, the manufacturer took a pair that was off, and hand fit them. Or they will sort through a bunch and test fit them, until they come up with a pair that fits correctly.

Tony

Thx Tony...that makes it clearer & makes sense.