Genuine Glock® 21SF or 20SF Lower Parts Kit OEM Gen 3 | G21sf LPK G20sf LPK from Marine Gun Builder. This is a Glock OEM parts only kit and frame is not included.
 
Please note - if you are building a PF45 you will need to modify the OEM housing to compensate for P80's mis-molding. Video walk-through download link will be included with the free assembly course code in the package - takes just a few minutes to fix.
 
For Builders - Most of the G20SF and G21SF lower kits online have the wrong parts. Whether you choose MGB as your OEM Freedom parts provider or not, you must insure the kit you are buying includes:
 
(A) The latest G20/G20SF G21/G21SF Trigger from Glock - It is stamped 4256-3 on the cruciform. This is the one you want. The originals sit too low in the frame causing a failure to return to battery problem.
 
(B) The trigger housing pin is different from all other models of Glock and specifically made for the Short Frame. Builders are constantly buying kits on ebay and getting the standard Glock TH Pin. This will stick out on both ends of the PF45 grip. It needs to be Glock SP01774 Polymer for SF models.
 
(C) The slide stop lever is also different from all other models. A standard Glock Slide Stop will periodically jam you up. Insure the kit you buy has Glock SP05423 Slide Stop Lever and Spring for SF Models.
 
Every Patriot who chooses MGB for their Freedom parts will receive a code shipped with their purchase for a Free Self-Paced Frame Assembly Online Course at Freedom Crew University.
 
MGB Guarantee:
I individually inspect each package for first time quality. When you buy from MGB, you are buying Authentic Genuine Glock® products.
 
This OEM Kit will provide perfect fitment and flawless function with the following frames:
- Glock G20, G21, G20sf, G21sf Gen 1-3
- Polymer 80 PF45
- Lone Wolf Timberwolf Large 10/45
- All Gen 3 Glock 20/21/20sf/21sf 3D printed lowers
 
All Parts in this Kit are factory OEM Glock® and include:
1. Trigger Bar SP04417 (Smooth Faced Shoe)
2. Trigger Housing SP05406
3. Connector SP00343
4. Trigger Spring SP00350
5. Slide Stop SP05423
6. Slide Lock SP00301
7. Slide Lock Spring SP05446
8. Trigger Pin SP00420
9. Locking Block Pin SP04368
10. Trigger Housing Pin SP01774
11. Mag Catch Spring SP00280
12. Mag Catch Button SP01035
 
Unmatched Value:
√ Free PF45 Fix Video include with course
√ Free Shipping
√ Free Self-Paced Assembly Course
 
Glock 21SF Glock 20SF Lower Parts Kit OEM LPK Gen 3 G21SF G20SF LPK by MGB
Glock 21sf 20sf SP04417 SP05406 SP00343 SP00350 SP05423 SP00301 SP05446 SP00420 SP04368 SP01774 SP00280 SP01035
 
Disclosures & Policies:
1. USA Shipping Only - No International Sales
2. We will not ship to alternate names/addresses - Shipping is to purchaser and address on their billing account only
3. Frames, Blocks, Rails, or other items in pictures are for illustration only and not included with the OEM Lower Parts Kit.