first off let me say I am knowledgeable about rifles. but my AR knowledge is limited therefore i'm probably gonna be asking a few stupid questions. I recently purchased a new Bushmaster QRC .223 with a red dot sight on it. I was wanting to put a vertical foregrip on it but it does not come with a rail. I was looking at a AIM Sports Inc Rifle-Length AR Free Float Quad Rail- V3 with a Bushmaster Short Vertical Forward Grip. are those compatible for the rifle? If not any help would be appreciated. also, i found one on opticsplanet for 39 that says it fits my bushmaster perfectly. shouldi just go with that one. it is a aim sports m4 handguard qual rail carbine length MT021.