I really do not know!
I got a reply from the seller after I bought this and I asked for more info on these parts and the kit as a whole... it says...
Quote:
The kit is pieced together with both Tantal and Onyks parts. The two weapons are Identical from the barrel trunion back. The barrel, gas piston, and gas tube, are Tantal parts cut down to Onyks specs. The Onyks handguard, Onyks late style muzzle device, and gas block combo are unique to the Onyks. The rear sight block rail was custom made for this build. These parts are very hard to come by and I have never seen a kit that came closer to the factory gun.
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I will have to look it over much better after I get it!