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1911 80% Frames & Retail Parts Compatibility

1911 80% Frames & Retail Parts Compatibility

Posted by 80-Lower on Nov 8th 2019

You might've come here from our guide on  How to Build a 1911 with an 80% Frame. Or, maybe you're just here out of curiosity. Either way, this guide compares the 1911's "retail" or factory-spec frames to their 80% counterparts. We cover the full-size Government, Commander, and Officer models,

DISCLAIMER: We're not lawyers, and nothing in this guide should be misconstrued as legal counsel. This guide is for educational and entertainment purposes only. Consult with an attorney before building a firearm in your state.

What is an 80% 1911 frame?

The 80% 1911 frame is a firearm frame blank that is mostly fabricated, but not yet functional. The blank is inoperable. You can't install a slide, barrel or any other parts on it, and cannot be made to fire without cutting and drilling some excess material from the blank, first. It is therefore not considered a firearm under the Gun Control Act of 1968. The ATF can only define and regulate firearms. They don’t regulate receiver blanks or frame blanks. In their eyes, the 1911 frame blank is no different than a piece of raw aluminum you bought at a hardware store.

But are these frame blanks truly the same when cut, drilled, and then compared to a retail 1911, say from Springfield, Kimber, or the like?

The short answer is yes. 

These frame blanks function with the exact same 1911 parts and dimensions as a gun you bought at the local sportsman's shop (minus the extra taxes and fees). We threw together some visual comparisons between the two:

Retail & 80% Frames Compared

Today, the 1911 is available in different configurations: Government (full-size), Commander (compact), and Officer (sub-compact). Each variant uses the same types of components and each is configured the same way. External and internal dimensions will vary, so not all parts are interchangeable.

Government 1911 (5" Frame)

The Government 1911 is considered the "O.G." shooter. It's John Browning's original design, sporting a 5" steel frame (often called a Government frame) and built using the same parts and specifications. This is the most popular type of 1911 sold and built in the U.S. Pictured to the left is its 80% counterpart.

The full-size 1911 carries 7+1 rounds and is considered a tank by most shooters. It weighs in at a whopping 40 ounces when empty (2.5 pounds), and measures 8.25" in overall length. All that size and weight is considered an advantage: The Government model is sufficiently accurate to 100 meters and potentially beyond, and it absorbs recoil efficiently.

Commander 1911 (4.25" Frame)

The Commander 1911 was introduced by Colt in 1950 as a service pistol for - you guessed it - U.S. Military officers. The Commander sports a slightly smaller frame made of aluminum (80%) or steel (most retail guns). It's frame and barrel are slightly shorter (4.25") and with configurations available in 9mm, .38 Super, and .45 ACP. The Commander is the product of the U.S. government favoring a lighter, smaller replacement for the Government shooter. The new Commander had to weigh less than 26 ounces (1.65 pounds), so it ditched the steel frame.

The Commander's smaller length (7.5" total) and lighter weight make it a popular carry piece among shooters. Sacrificing just 0.75" of barrel length, the Commander yields plenty of accuracy under 100 meters. Because vertical length is the same, the Commander also sports a 7+1 capacity. The Commander and Government 1911 models share mostly the same parts save for the barrel, barrel lug, and slide. Some shooters have found guide rods and recoil springs are interchangeable on certain models.

Officer 1911 (3" to 4" Frame)

The Officer 1911 is a departure from the original design. These super-compact shooters have new parts and revised dimensions to accommodate the 1911's functionality and calibers. The frame on an Officer 1911 is vertically shorter and has a lower magazine capacity of 6+1. Most Officer frames measure 3.5", with variations ranging from 3" to 4". Most parts on an Officer 1911 can not be swapped out with a Commander or Government model. Sporting a steel frame, most Officer models weigh 28 ounces empty and measure 7" in total length.

To make the Officer work, the barrel had to ditch a traditional barrel bushing. To accommodate the shorter slide, the barrel is also belled and contacts the slide itself. One locking lug is removed to allow the barrel to recoil back more toward the rear of the frame, to allow rounds to cycle reliably with the shorter slide rails.

DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, Hawaii, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.