Extreme tight fit in s2delta chassis!!! - HERA Arms AR15 Side Folding Unit Adaptor

Ok, it was a major work getting this SFU screwed into my S2Delta chassis. I had to confirm threads with other receiver to make sure threads were correct. I had to work it like tapping the threads! Also had to use a buffer tube as a wrench to get enough torque to twist it all the way in. Really i wouldnt recommend what i did because it may have torqued the hinge some. Anyway... It is a pretty nice design and it works great on the chassis. Its not coming off. Hope it lasts.
The threads on the S2delta chassis are thick threads and so are the Hera SFU.
The S2Delta chassis makes it easy to add a SFU without increasing length of pull by design.