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Mil-Spec Buffer tube went on my Rock River LAR-15. Screwed on easily. The ramp at the rear makes it easier to get a stock on. I put a Magpul STR sock on it and it adjust smoothly with very little wobble.
This AP gas block went on easily. Simple instructions to get it adjusted to the level that works the bolt. Took me 6 rounds to get it adjusted. It also comes with a long hex key to reach the adjustment knob.