If I’m assembling an AR lower I would go for a BCM LPK, but what is the equivalent when you assemble a stripped Glock slide?

I’m not looking to spend $150 on a Zev kit, but I do want something that is of “quality”. These will not be carry guns, just two “fun” ones but I want to enjoy shooting them rather than chasing problems because the kit is garbage.

Thanks in advance!