This is a replica that features slide blowback to simulate firing. 
 
Glock is a brand of polymer-framed, short recoil-operated, locked-breech semi-automatic pistols designed and produced by Austrian manufacturer Glock Ges.m.b.H. The firearm entered Austrian military and police service by 1982 and have become the company's most profitable line of products, and have been supplied to national armed forces, security agencies, and police forces in at least 48 countries.