Compact frames
The compact frame that started most home builds.
PF940C kits for Gen 3 Glock 19 and 23 slides, with the jig, rails, bits and end mill in the box.
Polymer80 PF940C 80% Compact Frame Kit (Glock...
Every frame here is cut for Gen 3 Glock slides. Match the slide first, then the kit. Gen 4 and Gen 5 slides need a conversion kit.
| Frame | Size | Slides it accepts (Gen 3) | Magazines | Kit |
|---|---|---|---|---|
| PF9SS | Single-stack | G43 | 6-round G43 | $123.67 → |
| PF940SC | Subcompact | G26, G27 | 10-round G26, larger with sleeve | $127.80 → |
| PF940C | Compact | G19, G23, G32 | 15-round G19 and up | $127.80 → |
| PF940v2 | Full-size | G17, G22, G24, G31, G34, G35 | 17-round G17 and up | $127.80 → |
| PF45 | Large | G20, G21 | 13 and 15-round | $123.67 → |
| RL556v3 | AR-15 lower | Any mil-spec AR-15 upper | STANAG | $103.06 → |
| G150 Phoenix2 | AR-15 lower | Any mil-spec AR-15 upper | STANAG | $61.84 → |
| LR-308 | AR-10 lower | DPMS-pattern .308 uppers | SR-25 | $82.45 → |












Use the finder above. Every kit ships with its own jig, so the frame decision is the only one that can go wrong.
Frame finder →The jig guides the pin holes; the rail tabs come off with the included end mill in a hand drill, or a file. Pistol frames take an evening. AR lowers go easier on a drill press.
Build guides →Locking block and rear rail modules are in the kit. Lower parts kits, pin sets, slides and barrels are on the shop page, sorted by frame.
Parts and slides →A kit here means the frame, both rail modules, the matching jig, the drill bits and the end mill together. That is the difference between a kit and a receiver-only listing, and it is the difference between finishing on a Saturday and waiting for a second parcel. Receiver-only options are listed too, for builders who already own the jig.