Needed this adapter for my mp5 clone. it fits nice and tight on the upper. Also using the Jmac side folder stock and it all goes together great. Absolutely a must have part for your mp5 related build!!!!!

The rear 1913 adapter to attach a folding stock works great and looks great!

Excellent product! Very happy with the fit and look!

Solid and quality made product. Took a little elbow grease but it was a good fit to my 53K clone.

You can tell a lot of time and thinking went into this adapter. The machining is perfect as well as the fit and finish.

Excellent fit and finish. Zero machining marks and sharp edges. Adapter locks up tight with no movement compared to factory AP5 end plate. May be a little too tight at first but expected from inconsistency of stamped receivers.

This item is a perfect fit for my MKE AP5 MP5 clone. The RSA-MP5 adapter shipped and arrived in just a few days, way faster than I was anticipation. The adapter fit snug and only required some mild tapping to get it to fit. The quality and craftsmanship is top notch. If you are in the market for a different set up to your MP5 this and a 1913 Stock/Brace are a solid way to go.

Excellent product just as described

I just got this in the mail. Installation did require a rubber mallet like the description said. No issues, mp5s are always finicky when changing the rear cap. Works great and feels amazing. Installed a mcx folding brace and it’s looking sweet.

Look, stop staring at this magical piece of machines marvel and just buy it. As soon as this RSA hit my mailbox, I skipped my happy butt out and got it, skipped back and tore the package open while grabbing my HK MP5. This thing fits! It’s slightly tight but as soon as I got it on, the pin hole lined up perfectly! Paired with the JMAC stock with the 1913 folder it’s straight sexy! The vertical rail allows you to adjust up and down on the stock so you can line up your sights with the cheek well. I’m so glad I found them and will be using them for future firearms parts.