Click on pictures to enlarge




FOR NEW ORDERS ONLY - Stocks and accessory rails

are factory installed.

The 1911 CCU’s are available in the following calibers:
.45ACP, 9mm (1 barrel left then 9mm discontinued), 40 Smith & Wesson & 460 Roland


Frame Size Compatibility: The only concern regarding what will fit and what will not fit is the length of the frame's dust cover. There are a few frames which have dust covers longer than a standard Government model and these may not fit the CCU. All compact frames like the Officers Model will function correctly.


NOTE: Factory Loaded Ammunition Only. MechTech recommends only using good quality factory loaded ammunition in the CCU. The CCU is a blowback operated action and is capable of safely firing ammunition up to +P. DO NOT USE +P+ or 'hotter' loads.

1911 NOTES

There is a certain 'juggling' of calibers relative to the CCU Upper of which one may take advantage. The 1911 pistol frame is designed to accept 1911 magazines of several different calibers. The proper magazine for your pistol is of course that for which the slide and barrel is designed. The fact that a 1911 magazine of a different caliber will function in the 1911 frame (when the frame is separated from the slide and barrel) allows one to order a CCU chambered for a cartridge different from that of the assembled pistol's frame you plan to use with the CCU Upper. Example: you have a 1911 which is designed to fire 45 ACP cartridges but you would really like to have a CCU in, say, 10mm. You can then order a 1911 style CCU Upper chambered for the 10mm cartridge and use the frame from your 45 ACP pistol with that CCU. You will need to acquire a 10mm 1911 style magazine and use it only when using the 45 ACP pistol frame with the 10mm CCU. Caution: this does not mean that you can use your 1911 pistol to safely fire a cartridge other than that for which it is designed by simply switching magazines - don't try this - it is dangerous! The barrel and slide of a 1911 pistol is designed for a specific cartridge and only that cartridge is safe to use when the pistol is assembled. Likewise, a CCU used with a 1911 pistol frame (lower unit) can safely fire only the cartridge for which the CCU is designed! This information is provided only to illustrate the flexibility available for 1911 style pistol frame and CCU combinations. Again - your pistol should be used only with the cartridge for which it is designed and a pistol/CCU combination must be used only with the cartridge for which the CCU Upper is designed. If further clarification is needed contact Mech-Tech Systems Inc.

Last Round Hold-Open - there is no last round hold-open function on the CCU.

Safety Lever - only the original GI style safety will function with the 1911 CCU. Extended and ambidextrous safeties will not function as a safety but the CCU will function and fire in all other respects.

The "Lower Unit"

To the left: a 1911 frame (also called 'lower unit') ready to install into a CCU Upper. No modificatons to the frame are needed! Complete lowers only are readily available available from many sources. This allows a user to have a dedicated lower for their CCU. Particularly for 1911's there are many sources for all internal components and naked frames allowing the more adventurous to build a dedicated lower for their CCU's the way they want it. None of the 1911 upper components are needed.
1911 Basic Unit Upper (click any image to enlarge)

This is the starting point to design your customized CCU. It comes with a 6" picatinny rail. The only required add-on is one of the stocks/adapter pictured on this page. We install your stock and any rail upgrades you select from our ACCESSORIES page, free of charge. Every unit is test fired before it ships.

BASIC UNIT 1911 $399.95



M4 Stock Adapter


This adapter attaches to the rear of the CCU housing. Many customers already own an M4 stock and buffer tube. The adapter accepts both military and commercial buffer tubes.

M4A $34.95 




This is a 4 position telescoping stock shown fully extended and fully collapsed.

TEL $89.95

Fixed Stock

Yes, it looks like an M4 adjustable stock. However, we have replaced the buffer tube with our own adaptor.

M4FS $34.95


M4 Stock

This photo shows a standard M4 stock (shown fully collapsed) with buffer tube mounted to the CCU using the adapter shown in the photo to the left. The M4 Adapter comes with this stock and so is incuded in the price shown.

M4 $99.95

NOTE: You can use a 1911 45ACP/10MM or 40S&W lower with a CCU Upper chambered in 9mm or 38 Super but in some cases - depending on the brand of the 1911 lower - you will need to change the ejector installed on your lower to a 9mm/38 Super ejector. This is an easy fix and the new ejector will generally operate correctly with the original pistol configuration. For 45ACP uppers, the lower should be fitted with the standard short ejector below: 1911 ejector


Certain 1911 style pistols such as the Paraordnance line have modified receivers which leave an opening in the magazine well in an area critical to proper feeding when these pistols are used with a CCU. Mech Tech has designed an insert called a 'Para Block' which solves the problem. Frames with 'ramped barrels' can be used with the CCU by installing the 'Parablock'. The photos below illustrate the difference between a 'standard' barrel (left photo) and a 'ramped barrel' (right photo).


NOTE: 'COLT' is a registered trade name and is in no way affiliated with Mech Tech Systems Inc. There are many other manufacturers of 1911 style pistols and the fact that Mech Tech Systems Inc. provides the CCU system as an accessory item for these pistols is in no way intended to imply that any of these manufacturers endorse or are associated with Mech Tech Systems Inc.