King Arms lower receiver compatibility
 

I'm planning on converting all my M4 builds to King Arms receivers, so I can swap them the way I want (lowers: max 345fps + max 390fps; uppers: 10.5in Block I + 14.5in Block II + 16in SPR Mod1).

I'm wondering if I'm buying 3 receivers, I'd have a surplus lower. Would that KA lower receiver be compatible with other brands uppers? (say G&G, that'd be the most likely because of the cansofts).

If it is, that means I could resell it. Just wondering as I'm planning my budget for that project, so that'd be helpful.

Cheers,
Conker

I have a King-arms receiver, and a G&G receiver.

The upper from the G&G didn't really fit right on the KA lower. Serious gaps in the sides, and the hop-up didn't mate properly with the air-nozzle.

It worked, but not correctly.

However, the G&G upper I was using was from a first gen CAS cansoft. Not sure if the new ones are of higher quality.

JG and SRC ones are compatible, so most non G&G cansofts are.

hmm well if you are going to get a King arms Reciever, they usually come with the upper as well, King arms is G&P and Marui compatible from what i know, but with some dremel and filing down certain areas they should fit. not a fan of G&G you should be better off getting a G&G lower, or else change the upper to King arms as well