Forums / Gun Discussion / Have question about M16A1 and all marks that follow it

5 years 26 weeks ago, 12:27 PM

LittleDragon

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can anyone explain why there such big difference in rifling from M16A1 to all mark of M16 that follow it ka Understand that problem cause bullet to keyhole after short distance. Did problem not show up right away in first mark of rifle ka

Your friend,

LittleDragon

Moshi Moshi from LittleDragon
5 years 26 weeks ago, 1:48 PM

runawaygun762

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Little Dragon

The 1 in 12" rate of twist of the M16A1 is suitable for lighter projectiles like the 55 gr M193, it is much too slow for the heavier 62 gr M855 (SS109) "green tip" round. Testing with the heavier bullet showed the 1 in 12 rifling reduced the effective range of the rifle to about 90 meters due to unstable rounds tumbling in the air. A rate of twist of 1 in 9" is the most ideal twist rate for a 62 grain round, but the 1 in 7" was chosen due to the longer length of the M856 tracer. Hope this helps a bit.

"I have always been a soldier. I have known no other life. The calling of arms, I have followed from boyhood. I have never sought another." From The Virtues of War, by Steven Pressfield.
5 years 26 weeks ago, 2:21 PM

LittleDragon

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runawaygun762 san

ryo know he can alway rely on you and victor chan to know answer to question about rifle. arigato goziemasu!

Your friend,

LittleDragon

Moshi Moshi from LittleDragon

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