Freedom Wolf Resources
The Freedom Wolf 80% Glock platform frame by Lone Wolf offers compatibility with gen 4/5 slides, but also requires a unique combination of parts that make it slightly more complicated. It requires a gen 4 trigger housing, gen 4 magazine release, but a gen 3 locking block. The frame CAN be modified to accept a gen 4 locking block, but warranty support from LW would be forfeited.
The all-in-one LPK from LWD is the easiest most cost-effective option, but is rarely in stock.
If you can't get your hands on the LWD completion parts kit, you can get it done by ordering all of the individual parts listed below it. That's how I did mine, and it runs great.
Freedom Wolf frame in stock at Brownells
LWD all-in-one LPK (rarely in stock)
Compact Gen 3 Locking Block (MatchPoint)
OEM Polymer Trigger Housing Pin (Brownells)
Magazine Release (Big Tex)
Trigger Housing gen 4 (Midway)
Aftermarket LPK gen 3
NOTE: you will need to swap out the housing and mag catch to gen 4, as well as order the locking block and rear pin separately.
Cleaner and faster than tearing tabs off with pliers.
Freedom Wolf Holsters by Vedder