if u've got ENOUGH velocity and penetration,more isn't NEEDED. Hey, <font color=red>*</font><font color=red>*</font><font color=red>*</font><font color=red>*</font><font color=red>*</font>, when have the 22unit for the AR, u dont NEEDmuch inthe way of range or power out of the M21.
M21,at 5m,WILL knock you for a loop with a skull hit, and that's asmuch power as is needed. At least it can be ccw'd, and SUDDENLY draw and hit with,while wearing a backpack,unlike the canned Ruger. There's just no place to PUT an 11" long pistol, and both conceal it and have swift access to it, given the restrictions of the backpack.
if the CARis concealed in the pack,the M21 comesout of the thigh pocket and goes into either the fanny pack (top opening) at the navel,or somewhere IWB, (no fanny pack).
Just because YOU can't get-by with a "mere" 30 lbs of non-fighting gear doesn'tmean your BETTERS can't do so. It just means that you are INFERIOR,that's all.