Have you ever figured out the issue fitting the SEF lower to your PTR? I am just about to order a SEF Lower housing from HK Parts.net but after reading through this thread and the guy that butchered his, I don't know
if I want to take the chance. I would appreciate an update and the final outcome and hopefully a solution to your problem. Thank you!
PTR 91 A3R
PTR 51P PDW
Any final updates on this? I’m about to order a binary trigger and was going to order either a c/p SEF or Picto housing to drop it in, but after seeing all of this I may have to reconsider..
Are there any updates preferably finished product pictures to this post? I just cleared away some of the plastic from the trigger housing on the SEF and I can get it on and force the pin back in the back plate but it still seems like the housing should be a tiny bit farther forward. Function check shows the gun to be working properly thus far.
I just took this project when i purchased my binary trigger and SEF lower from HKPARTS. Other then the ears that need to be completely ground flat, you need to remove the teeth that come down of the area that sits on the shelf on the receiver. No one from HKPARTS or HKPRO has explained this. The teeth are blocking the shelf from seating in the lower properly.