GLOCK 21 SHOOTING REVIEW: Big Gun, Big Round, Soft Spoken HD

T-SHIRT COURTESY OF: http://www.ENDOapparel.com/ MrColionNoir on Twitter: http://twitter.com/#!/mrcolionnoir MrColionNoir on Facebook: http://www.facebook.com/COLIONNOIR MrColionNoir on Google+:https://plus.google.com/u/0/ MrColionNoir on Instagram: @MrColionNoir The barrels of all .45 ACP Glock pistols feature octagonal polygonal rifling rather than the hexagonal shaped bores used for models in different chamberings. Octagonal rifling provides a better gas seal in relatively large diameter rifled bores, since an octagon resembles a circle more closely than a hexagon does.[38] The Glock 21 is a .45 ACP version of the Glock 20 designed primarily for the American market. Compared to the Glock 20 chambered in 10mm Auto, the slide of the Glock 21 is lighter to compensate for the lower-energy .45 ACP cartridge. The standard Glock 21 magazine is of the single-position-feed, staggered-column type with a capacity of 13 rounds.