80% Frame Compatibility Guide
The GLOCK® and 1911 handguns are perhaps two of the most popular firearms in America. It’s no surprise 80% frames have been made for custom builds. This guide compares frame blank compatibility with handgun models, calibers, and parts.
The G80: Today’s Glock-Compatible 80% Build
For a side-by-side comparison, read P80 vs G80: How the Polymer80 Frame and G80 Compare.
Polymer80 no longer makes frames, so the P80 models below are out of production. If you’re starting a new Glock-compatible build, the G80 is our current platform. Instead of a one-piece polymer frame, it splits the job between two parts:
- G80 Unfinished Receiver: the 80% part you finish. It’s a steel fire control unit (locking block, trigger housing and slide rails machined from one piece of heat-treated 4140 steel), compatible with GLOCK® 19/23/32 Gen 3 parts.
- G80 grip module: the polymer grip your finished receiver drops into and pins in place.
The G80 Grip Module
The grip module is compact, made in the USA and has a Picatinny-style accessory rail.
The G80 Grip Module gives you smooth GLOCK® 19 Gen 3 ergonomics in a holster-ready profile. It runs GLOCK® 19, 23 and 32 magazines (9mm, .40 S&W and .357 SIG) and the Magpul PMAG 19 GL9. Because it’s built to the 120R standard, the receiver isn’t tied to one grip.
Want everything at once? The G80 Polymer Jig Build Kit includes the receiver, grip module and jig. Already own the jig? Get the G80 Next Build Kit with the receiver and grip module. Then add a Glock-compatible build kit for the slide, barrel and parts.
Gen 3 parts that fit a P80 also fit the G80, including our Glock slides, complete slide kits and lower parts. Shop all G80 frames, grip modules and kits, or see every 80% frame we carry.
All P80 Frames Are “Gen 3”
The Polymer80 line of frames are compatible with Gen 3 GLOCK® parts. Some Gen 4 and newer GLOCK® parts are
not compatible with 80% frames.
These Gen 4+ parts are incompatible with Gen 3/P80:
- Slide
- Frame
- Recoil spring
- Trigger housing
- Magazine release button
These Gen 4+ parts are compatible with Gen 3/P80:
- Trigger bar
- Connector
- Ejector
- Magazine
Types of 80% Pistol Frames
Polymer80 developed five GLOCK® 80% frames: The PF940C, PF9SS, PF940V2, PF45, and the PF940SC. Polymer80 no longer makes them, but many are still in use, so we’ve kept their compatibility details below. For a new build, see the G80 above.
Stealth Arms made two variants of the aluminum
1911 80% frame: .45 ACP (Full-Size / 5″), and 9mm (Full-Size / 5″). We no longer carry 80% 1911 frames.
Polymer80 PF940C Frame
The PF940C is the most popular Polymer80 frame available today. It’s used to build a handgun like the
GLOCK® 19 (9mm), G23 (.40 S&W) and G32 (.357 SIG).
Frame & Parts Compatibility
- No longer made. The closest current option is the G80, which is GLOCK® 19 Gen 3-compatible.
- The PF940C is compatible with all these G19 parts.
- Pair any of these G19 Pistol Build Kits with this frame.
Polymer80 PF9SS Frame
The PF9SS 80% frame is a compact 9mm frame, designed to work with the Glock® 43 (9mm) platform only.
Frame & Parts Compatibility
- The PF9SS is compatible with all these G43 parts.
- Pair any of these G43 Pistol Build Kits with this frame.
Polymer80 PF940V2 Frame
The PF940V2 frame is Polymer80’s most widely compatible option. It is designed to work with the
GLOCK® 17 and G17L (9mm), G22 and G24 (.40 S&W), G31 (.357 SIG), G34 (9mm) and G35 (.40 S&W) handguns.
Frame & Parts Compatibility
- The PF940V2 is compatible with these G17 parts.
- Pair any of these G17 Pistol Build Kits with this frame.
Polymer80 PF45 Frame
The PF45 is one of Polymer80’s largest caliber frames. It’s designed to work with the
GLOCK® 20 (10mm Auto) and G21SF, also called the “G21 Short Frame” (.45 ACP).
Frame & Parts Compatibility
- The PF45 is not compatible with standard G21 parts.
- The PF45 is compatible with G20 and G21SF parts (sold elsewhere).
Polymer80 PF940SC Frame
The PF940SC is designed to work with the
GLOCK® 26 (9mm) and G27 (.40 S&W) platforms.
Frame & Parts Compatibility
- The PF940SC is compatible with these G26 parts.
- Pair any of these G26 Pistol Build Kits with this frame.
Build Kits for Your Frame
Our Glock-compatible build kits include the slide, barrel and parts kits to finish a G80 or P80 build.
80% 1911 Frame
Stealth
Arms’ 1911 80% frame are made from aluminum instead of steel, providing easier fabrication before assembly.
Frame Options
The full-size (5″) 80% 1911 frame is designed to replicate the original
M1911 Government frame. Stealth Arms frames are available with a raw finish or black hardcoat anodizing. Each frame is available with or without an under-barrel Picatinny rail.
Features & Specs:
- Forged and machined from 7075-T6 aluminum.
- Compatible with these 1911 Pistol Build Kits.
- Made in 9mm and .45 ACP. We no longer carry them; see our 1911 parts.
- Accepts standard steel 1911 magazines.
P320 80% Frame
Sig Sauer introduced the P320 modular handgun to replace its P250 DAO
handgun. The P320 departs from Sig’s usual designs and uses a
universal “fire control unit”, or FCU. The modular FCU is considered the firearm-by-legal-definition. All other P320 parts are unregulated.
This allows owners to
easily swap the barrel, slide, magazine, caliber, and even size of the
pistol.
The 80% version of this new fire control unit is compatible with all factory and aftermarket P320 parts.
The P320 FCU can be swapped out for four sizes/profiles:
- Full Size (4.7″ barrel)
- Carry (3.9″ barrel)
- Compact (3.9″ barrel)
- Subcompact (3.6″ barrel)
Although they share the same barrel, the Compact P320 is shorter (5.2″) than the Carry version (5.5″).
The P320 accepts four calibers:
- 9mm
- .357 SIG
- .40 S&W
- .45 ACP
