[Fotomaniac]

According to Brent...there are some differences in tolerances between the two. The USMC pistol is beefier where the dust cover and rail are. Others have asked these questions in this and other forums before. The answer from Colt has always been that the double spring system only fits the USMC Pistol.

 

[Fotomaniac]

There is a big difference. The CQBP goes thru the Custom Shop. Match barrel, nite sights, super accurate. These differences have been discussed ad nauseum.