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Both KelTec 5,56 rifles & pistols have successfully utilized POLYMER uppers for 5 years now
Damn, I forgot about those. Well played, Sir. They also did the piston driven upper before the AR community picked that up.
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Both KelTec 5,56 rifles & pistols have successfully utilized POLYMER uppers for 5 years now
Carbon 15 uppers[ and lowers] are carbon fiber, not polymer. They are much stronger than a polymer upper would be. I've seen 22 ar 15 clones with polymer uppers but never any centerfire rifles.Have had no problems with my Bushmaster Carbon 15 other than the dust cover not latching. I fixed that and have had no issues since.
Carbon 15 uppers[ and lowers] are carbon fiber, not polymer. They are much stronger than a polymer upper would be. I've seen 22 ar 15 clones with polymer uppers but never any centerfire rifles.