help me find a side folding stock adapter!

[loose_holster_dan]

i'm going to finally put thru my paperwork to sbr my sig p556.

does anyone have any suggestions for a good side folding adapter that will fit this weapon and a magpul ubr? i've seen the ACE adapters, but i heard they rattle.

 

[loose_holster_dan]

picked up the ubr stock. still waiting for advice on the side folding mechanism.