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Colt M16 R0901 Complete Upper Receiver Groups 223/5.56 SP401304

Colt
Colt M16 R0901 Complete Upper Receiver Groups

Colt M16 R0901 Complete Upper Receiver Groups 223/5.56 SP401304

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Colt M16 R0901 Complete Upper Receiver Groups 223/5.56 SP401304

Colt
Colt M16 R0901 Complete Upper Receiver Groups

UPC
098289600189: MPN
SP401304: Brand
Colt: Model
Colt M16 R0901 Complete Upper Receiver Groups: Caliber
223/5.56: Type
Upper

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Sorry. My error. In my senility I overlooked your "lightweight" spring use. Those springs would certainly throw some codes and cause all sorts of experimentation. I'm still curious why the 124 Rem fails when the factory specs list identical velocities. Maybe the test barrel was longer. I'll have to chrono some. I have probably 15-20 9mm's on the rack, mostly alloy Sig and Beretta, some CZ and HK, Glock, S&W, FNH, etc., in hammer, striker and external extractor 1911 designs, use only duty weight springs, no subs or suppressors, no steel case, and don't shoot them as much anymore. They tend to be boringly reliable with major brands and reloads, with accuracy as the only variable. The Blazer was the only brand causing problems, and that out of a stiff M17. Oh, and a S&W SD9 which was such a POS that it became a test dummy.

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