21 Short Frame Generation 3	  
	
The Glock 21SF has some minor exterior design changes as compared to the
Glock 21. The Glock 21 a standard third generation Glock pistol, sports the
molded-in finger grooves in the grip frame and a mounting rail on the dust
cover for mounting lights or lasers. The Glock 21SF incorporates three
changes. The first is the ambidextrous magazine release, the redesigned
magazines will function in both designs, but the old magazines don't have
the necessary cut out in the front of the magazines to function in the
redesigned weaon.The magazine capacity didn't change: you still get 13
rounds of .45ACP in the mag, plus one more in your chamber. The second the
size of the grip frame, it is noticeably thinner from the backstrap to the
trigger (Short Frame) . The third is the modification of a full MIL-SPEC
1913 Picatinny rail system on the dust cover.