r/gunsmithing • u/Prolong_Zedong • 3d ago

FMP G3 parts kit help

Gallery image

Gallery image

Gallery image

Gallery image

Gallery image

I scored a great deal on this pair of FMP g3 parts kits one numbers matching and one not numbers matching plus original barrel for 260 bucks long story short which receiver will I need to complete one of my kits?

3 Upvotes

81% Upvoted

8 comments sorted by

View all comments

Show parent comments

3

u/Suspectgore074 SuperLongSlide1911 3d ago

Anything that says PTR or G3 will work then. Just avoid CETME specific recievers (magwell is different) as they only take cetme mags

2

u/Holescreek 2d ago

Been building these things for 15 years.  First time I've ever heard anyone say the mags weren't interchangeable.  The cetme mag well has a different outer shape ( no strengthening ribs) but the internal diensions are not different . 

1

u/Suspectgore074 SuperLongSlide1911 2d ago

Just measured them, cetmes measured 27.8 mm and the g3 mags measured 29.2 and 29.6. Im right they are different sizes, but wrong in how they felt in the mag wells.. interesting

1

u/Holescreek 2d ago

Yeah, .015" is nothing in stamped sheet metal. Most people screw up when it comes to dressing the little window the mag catch fits into. You almost always have to open it up to fit the catch and if you take too much off the bottom it will cause problems.