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Description: semi auto action - 20' fluted barrel, Picatinny rail sight - syntheticstandard stock- crisp markings - matte black finish 98% + - appears fired very. Nov 28, 2014 I have emailed Bushmaster and they. Question about older Bushmaster rifle. Starting in October 1967 and prior to serial number.

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I have BL04454 am i a 2nd gen or 1st gen?You have a 1st gen. 2nd gen ACRs are only in the prototype / field test copies and only available from Remington Defense.

(not available for purchase) The have been a handful of changes to the ACR to include; Exhaust hole for the gas regulator was change on the 's' side Firing pin and spring was updated (recall) Stronger Piston spring (uses squared off spring instead of round) There is a thread somewhere on the forum that has pictures of the different regulators and piston springs. BTW, welcome to the forum!!

I just bought a bk enhanced model s/n ACR0008X. It appears to have the new spring and firing pin but the old regulator and spring.

I have yet to call BM to further investigate what has been done. The upper was also stamped as Dallas.Sweet and welcome to the forum. The regulator change is mostly for firing suppressed. The newer piston spring is for certain copies that are a little over gassed and have issues with 5.56 ammo. (It is not a wide spread problem) Only way to know is take her to the range, get her dirty.

Remove Drm Protection From Wmv Files on this page. She'll let you know what she needs. (the spring is an easy user swap item).