Quote:
Originally Posted by JGarcia
Yep, the bullet drop on the TA31F reticle is definitely for 20" barrel firing M855 ammo; it is NOT correct when it comes to bullet drop for an M4, never mind that it is supposed to be for an M4.
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The answer from Trijicon is:
1: The width of the TA31F chevron represents 19 inches at 300m. Not 19.5 inches. Also, one may need to reduce a possible “ballooning” effect of the chevron if it is under bright light. This may make the chevron appear larger than it is. The tried and true solution for this is placing some riggers tape over the fiber optic tube to adjust brightness.
2: The BDC of the TA31F is not based on the trajectory of a 14.4 inch or a 20 inch barrel- it is based on 62 grain bullet exiting a muzzle at 3050 ft/sec (about a 16 inch barrel).
3: The TA31RCO-M4 (USMC RCO, carbine version) and the RCO-M150 (US Army RCO) both have their BDCs based on the trajectory of a 62 gr bullet from a 14.5 inch barrel.
Hope this answers the mail.
TR
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De Oppresso Liber 01/20/2025
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