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FN FN15 Military Collector M4A1 Upper Receiver Assembly 223/5.56 845737017347

FN
FN 15
FN 15 Military Collector M4
FN FN15 Military Collector M4A1 Upper Receiver Assembly

FN FN15 Military Collector M4A1 Upper Receiver Assembly 223/5.56 845737017347

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FN FN15 Military Collector M4A1 Upper Receiver Assembly 223/5.56 845737017347

FN
FN 15
FN 15 Military Collector M4
FN FN15 Military Collector M4A1 Upper Receiver Assembly

UPC
845737017347: MPN
36318-07: Brand
FN: Main Model
FN 15 Military Collector M4: Model
FN FN15 Military Collector M4A1 Upper Receiver Assembly: Caliber
223/5.56: Type
Upper: Barrel Length
16"

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Remington 23728 UMC Full Metal Jacket FMJ 115 Grain 9mm Luger/Parabellum - 1000 Rd - $199.99

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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I can get it to run in a cz. Not in any striker fired pistol with their more radical cam. As you go to lower spring weight in striker fired other problems are introduced. I've tried. I've got 5 k of it.

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Gonna take it gun show and dump it.

Care to share the firearms it runs in for you?

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