har1690 Posted October 21 Report Share Posted October 21 Thinking about buying a Colt 10.3" upper for my M16. Are these plug and play on a Colt M-16A1 lower? Quote Link to comment Share on other sites More sharing options...
MPFiveO Posted October 21 Report Share Posted October 21 For the most part yes. It might run slow with an A1 stock and buffer but it will still run because they're overgassed. With a carbine stock you'll want to run a H2 or H3 buffer. Quote Link to comment Share on other sites More sharing options...
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