I don't own one yet but I shall soon. I examined them closely and they have a polymer upper and metal bolt and working parts. They VERY closely resemble an M-4gery and I think they will be a bit better than using a CMMG insert and leading my barrel(a little). The Colts are worse because their mags are set up for the 22 lower and are not in ANY way the same as a Colt M4. NO parts interchangeable. At least Chiappa can go right on the lower I have. Also a flat top so you can put any minor optic you wish on it. Chiappas mags will fit a standard lower. I don't know what would happen with Colt mags. S&W are the same as Colt.Information
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