Initially, I was concerned that it wasn’t going to fit on my SP5K because of the welded plates that are on the rear. Everything fit on wonderfully and it has the same holes for the two pins. If anyone is wondering, it fits on the SP5K just fine. It does have a slight vertical wobble but not enough to bother me.

Too tight , bottom pin hole doesn't line up. Looks cool but aiming ur gotta break ur neck. rather Get a folding brace for the price Also I'm seeing online you gotta dremel some clearance for the hammer shank. $500 and you gotta cut into it still? Tighten up , step it up, get it together BT Parts-These are made for true HK pattern firearms. They fit other brands as long as they are made to the correct specs which means your AP5 isn't in spec.

I love it. Fits perfectly on my AP5 M. Took me less than 5 minutes to slap on. It was totally worth 500$

Excellent product extremely compact when collapsed with quick deployment when needed very stable as well

Great construction and excellent quality. Perfect fit and function on my MKE. Quick and easy deployment. Highly recomended.

Excellent product. It mounts seamlessly and provides several brace lengths for use.

Good quality,decent price,shipping super fast.recommend.

Great stock and its the best of the best!

By far the best afterma Option out there! Solid, smooth, and almost zero footprint!

I ordered this stock for my AP5-P. I was a little concerned after reading some of the reviews that it may not fit as well as it might on an MP5-K. I opened the box and was really impressed with the quality. Within minutes I had the stock installed, which fits and works very well. This is a perfect addition to my new SBR.