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Posted: 3/11/2005 4:01:05 PM EDT
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Does anyone have a source of what changes were included in each M16 revsion (A1 through A4)? Thanks. |
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Someone here posted this recently: AR-15 (USAF) - Colt Model 601, 20" barrel, A1 rear sights, fixed A1 style stock, type 2 duckbill FH, triangular handguards, no FA, S-1-F M16 (USAF)- Colt 604, 20" barrel, fixed A1 style stock, type 2 duckbill FH, triangular handguards, no FA, S-1-F GAU-5/A - Colt Model 610, 10" barrel, A1 rear sights, first gen retracting stock, 4.5" moderator, short round handguards, no FA, S-1-F GAU-5/A/A - Either Colt Model 630 or 649; Colt 630, 11.5" barrel, A1 rear sights, first gen retracting stock, 4.5" moderator, short round handguards, no FA, S-1-F; Colt 649, 11.5" barrel A1 rear sights, first gen retracting stock, 4.5" moderator, short round handguards, no FA, S-1-F GAU-5/A/B - Colt 629, 11.5" barrel, A1 rear sights, first gen retracting stock, 4.5" moderator, short round handguards, FA, S-1-F GAU-5/P - Either Colt Model 653 or previous GAUs brought up to this standard; Colt 653, 14.5" barrel, A1 rear sights, first gen retracting stock, birdcage FH, short round handguards, FA (no FA if rebuilt from weapons not orginially featuring this), S-1-F GUU-5/P - In house rebuilds with 14.5" M4 profile barrels, or rebuilds with the upper receiver simply replaced with a flat top M4A1 style upper or a fixed handle M4 upper. XM16E1/M16A1 - Colt 603, 20" barrel, A1 rear sights, FA, fixed A1 style stock, triangluar handguards, type 2 duckbill FH, S-1-F M16A1E1/M16 PIP - Colt 645, 20" A2 profile barrel, A2 rear sights, FA, fixed A2 style stock, round handguards (round handguards and A2 sights clearly visible on pages 348 and 349 of The Black Rifle, A2 FH, case deflector lump, S-1-3 M16A2 - Colt 645, 20" A2 profile barrel, A2 rear sights, FA, fixed A2 style stock, A2 FH, case deflector lump, S-1-3 M16A2E3/M16A3 - Colt 646, 20" A2 profile barrel, A2 rear sights, FA, fixed A2 style stock, round handguards, A2 FH, case deflector lump, S-1-F M16A2E4/M16A4 - Colt 945, 20" A2 profile barrel, flat top/detachable carry handle, FA, fixed A2 style stock, round handguards, A2 FH, case deflector lump, S-1-3, commonly standard with the KAC M5 RAS XM177 - Colt Model 610, 10" barrel, A1 rear sights, first gen retracting stock, 4.5" moderator, short round handguards, no FA, S-1-F XM177E1 - Colt Model 609, 10" barrel, A1 rear sights, first gen retracting stock, 4.5" moderator, short round handguards, FA, S-1-F XM177E2 - Colt 629, 11.5" barrel, A1 rear sights, first gen retracting stock, 4.5" moderator, short round handguards, FA, S-1-F XM4 - Colt 720, 14.5" barrel, A2 rear sights, second gen retracting stock, A2 FH, short round handguards, FA, case deflector lump, S-1-3 M4 - Colt 777 or 920, 14.5" barrel, A2 rear sights or flat top/detachable carrying handle, second gen retracting stock, M4 feed ramps, A2 FH, short round handguards, FA, case deflector lump, S-1-3 M4E1/M4A1 - Colt 921/921HB, 14.5" barrel, M4 feed ramps flat top/detachable carry handle, second gen or third gen retracting stock, A2 FH, short round handguards, FA, case deflector lump, S-1-F M4E2 - Colt 925, 14.5" barrel, flat top/detachable carry handle, A2 rear sights, second gen retracting stock, A2 FH, KAC M4 RAS, FA, case deflector lump, S-1-3 XM106 - 20" HBAR profile (quick-change), permanently fixed triangular handguards, no case deflector lump, modified A1 rear sight, fixed stock, FA, birdcage FH, S-1-F XM231/M231 - 15.6" barrel, FPW handguards, no case deflector, A1 style rear sights, retractable M3A1 style wire stock, no FA, A2 FH, S-F |
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