But he's not talking about putting one in a Glock,he's wanting to put one in a .30 .30,which goes into the stock,in which he will feel a noticable amount of less recoil,I have one installed in a 30-06,big differance in felt recoil,also in a Puma .454 carbine,also less felt recoil.But I guess its your preferance what you want on your own firearm.I didn't even know they had one for a handgun.And also,sm is on the right track,a good fitting firearm will have less felt recoil,but if you have what you have and want to help out what you have.....I like them,but like I said,personel preferance.