The guy that made them for the group buy sells his products on Gunbroker. Above is a link to one of his sales.
Own: HK91, SP5k, G36k, HK416, P30L, 2x P8, P8A1, USP SD, USP9, USP9 FDE
Future: SP5? Assuming I can find an honest seller.
PJT thanks I decided to just buy the one you recommend and said is better made by the M8 Industries company. Thanks again to all members.
Aimpoint micro on the B&T mount is a classic.
I wouldn't mind an RMR mount since it's a bit more aesthetically pleasing with the optic. However, the most common option out there replaces the rear sight...which is a no go for me. There doesn't seem to be a "traditional" claw mount that makes it cowitness.
I called Aimpoint when I purchased the H2 micro. They said to replace the thick/tall HK mount that came with the SP5K with the B&T low mount that attaches directly to the firearm. I got the extended low mount to help clear the charging handle better. Aimpoint also said to get the fixed and not quick disconnect attachment for the H2 that attaches to the B&T mount. He said the QD when going on and off will hold zero for practical purposes but not 100%. This provides a 3rd co-whitness where the Aimpoint dot is between the top of the front post and the top of the sight ring. Very easy to get used to and shoots 1" groups at 25 yards. Perfect for me.
I went with an AIMPOINT T2 Red Dot, with a B&T low mount. The only issue, the mount has the T2 too close to the cocking handle, making it tight to operate. I ended up getting a MFI, which gives a couple more rails to adjust the T2's position.