Quoted:
bump for anyone else that knows
Just wanna know how the M45A1 is different from your typical Colt Rail Gun.
A lot of the information is spread out amongst different threads, like the MEU(SOC) .45 thread.
Another good thread:
http://www.ar15.com/forums/t_2_29/222048_Colt_Rail_Gun_Selected_for_MARSOC.html&page=1
The largest difference between the "M45A1" and the Colt Rail Gun is the dustcover accessory rail dimensions, which is a larger difference than you might expect, because it more than likely required a brand new forging to be created, as I doubt the original CRG forging had the material for it, but I can't confirm that.
The CRG, like most railed dustcover pistols does not have a MIL-STD compliant 1913 rail, but rather a modified dimension that will fit almost all existing Picatinny Rail interface accessories that currently exist. However, the military requested that a MIL-STD 1913 rail be used, as future accessory manufacturers may build from MIL-STD prints and dimensions, and could potentially not fit a commercial railed frame.
In order to do so, the CRG's dustcover had to be increased in depth to allow for the full MIL-STD 1913 dimension. In order to offset the weight, a lightening cut was introduced inside the dustcover which may or may not have been omitted in production variants, but was almost certainly modified.
Funtionally, MEU(SOC) .45s had, in the past, been supplied with Wilson Combat Shok-buffs. The "M45A1" introduced a dual, nested recoil mainspring design that is not present on the CRG and not currently available commercially other than (presumably) the civilian "M45A1s" scheduled to be released.
Also, some of the parts, more than likely the barrel, link, bushing, disconnector, hammer, and possibly the thumb and grip safety may be different or at least held to much stricter tolerances to fulfill the Marine Corps requirements for 100% drop in interchangeability, a feat not yet seen in a 1911 platform, and intended to reduce the demands on Marine Corps 2112 precision gunsmiths.
More minor differences include the trigger which appears to be a solid long trigger, though early test models came with medium length triggers. Also, the sights are Novak low-mount night sights, rather than the standard, non-tritium three dot sights on the CRG. The mainspring housing is also different, and features a military-style lanyard loop, while the grip screws are slotted and appear to be larger than standard grip screws.
Other than that, the differences are largely cosmetic, the "FDE" CeraKote, as well as wider spaced cocking serrations, G10 grips (possibly VZ or MilTech), and obviously the markings.
Finally, my understanding is that the commercial "M45A1s" will be supplied with Wilson 47 magazines that are used with other USMC 1911s, rather than the flush magazines supplied with the CRG.
~Augee