I’m working on two Colt builds right now, and am debating a Vltor MUR upper for one or both, but don’t have much info on the MUR from the last decade or so. Opinions range from Vltor being most awesomest to making no difference vs. a mil-spec upper. The price of a Colt and Vltor upper are essentially the same.
Here’s what I’m working with:
GUN 1:
Factory Colt 6933 SBR. Pencil barrel will be replaced with Colt 11.5 HRT heavy barrel, with KAC MAMS brake and QDC can with Geissele Federal rail.
GUN 2:
Mostly- or all-Colt Frankengun built around chopped-FSB 11.5 HRT HBAR on Charlie’s Custom Clones Colt pistol lower. Will be unsuppressed version of SBR, with either flash hider or possibly Surefire Warden, but no can to ensure no NFA issues.
Both guns will have Geissele rails, Colt BCGs, and BCM Gunfighter charging handles. The 6933 will need the FSB chopped, and I’m planning to have Specialized Armament do the barrel work/chop, along with their Reliability Package. I’m on the fence about sending out the pistol to SAW, ADCO (if SAW refuses to work with non-Colt parts), or doing the work myself at a shop I have a relationship with and will let me use their tools.
My question(s): Should I:
1) Buy a Vltor upper and use it for the SBR which will have the heavy barrel plus the can, and therefore benefit from a stiffer upper, and transfer the Colt upper to the pistol?
2) Buy 2 Vltor uppers and install them on both guns?
3) Buy 1 Vltor upper and use it on the pistol, while leaving the 6933 SBR (mostly) stock?
4) Forget about Vltor entirely and go Colt OEM for both uppers?