I'd go with Quarter circle 10 before LW. Then buy a bbl and bolt from them or other vendor that has them in stock. Install on upper of your choice and shoot away. The Glock Lowers / lowers that use glock mags. The Bolt carrier needs to be relieved on one side to allow clearance of the ejector. Most bolts also need to be profiled for clearance of the mag, when using glock mags, their lowers etc.




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