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AR15.COM
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12/8/2013 7:46:01 PM EDT
. newbie question which  rainier charge handle is used for a 300 blk the 7.62 or 5.56
12/8/2013 8:29:27 PM EDT
[#1]
The 5.56 one.

The nice thing about .300blk is that everything, except the barrel of course, is just normal 5.56 parts. The 7.62 charging handle is for the larger AR10 reciever.
12/8/2013 8:39:59 PM EDT
[#2]
thanks for the info
12/9/2013 3:27:27 AM EDT
[#3]
CH has nothing to do with the caliber of the firearm.  It must fit the platform.  So, anything on the AR-15 platform takes the AR-15 CH.  Any caliber on the AR-10 or LR-308 platform take the longer .308 CH.
There may be exceptions to this, such as I know the PRI GasBuster and BCM Gunfighter will not fit my pre-2004 DPMS .22 LR conversion and the AR-5.7 x 28 does not use a standard CH but those are the only two exceptions I can think of off hand.
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