May 1, 2008 · When zeroing the M4 at 25m, set the BDC to 6/3 +2. Make all your elevation changes on the front sight so the BDC will work. Center your group in the lower half of the center bullseye. At …

Jan 7, 2026 · Is the M4 carbine a “retro” configuration now (Page 1 of 2) Previous Page / 2 Next Page

Jun 11, 2025 · A1 upper with or without M4 feed ramps - is it necessary? 1st retro build, and all my other upper receivers have had M4 feed ramps. My build is based of a Carbine. I have read mixed reviews …

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Dec 10, 2023 · Just wondering what aftermarket triggers you guys have used?Doing some research, resulted in very limited info. Some guy on rimfire site reported that the SSA-E didn’t work because …

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Mar 7, 2025 · Here's a Colt R0933 date 11/6/96 has M4 feed ramps with no M4 stamp by gas tube hole. I believe Colt started adding M4 feed ramps in the early 90's. Attached File

Dec 20, 2011 · M4 = fixed carry handle, round double heat shield handguards, can be had with burst or full auto settings M4A1= flat top, standard with KAC-RAS picatinny railed aluminum handguards, …

Jul 27, 2025 · FYI, a M4 extension will work just fine in a receiver not cut for the extension. The only problem is when you run an extension with out M4 ramps in a receiver with M4 ramps cut into it. This …

Jun 15, 2025 · Curious to see who is running some form of forced reset with a 22LR. Either a drop in cassette style or super safety style. Interested to know what you are using (trigger), what upper, …