Don’t remember who all I talked to about wanting to build one of these, but I finally got it done. The 80% MUP-1 was super easy to complete. The hardest part was ordering the parts to complete. I ordered each part individually because no one had the full parts kit in stock at the time I started the build. I did not know anything about Sigs (hadn’t even shot one) before beginning this project. Now I feel I have a firm grasp on the assembly aspect. I still do not have the level of understanding that I have with Glocks, but that will probably happen in time.
JSD Supply 80% MUP-1
Grey Ghost Precision slide parts kit
Apex trigger kit
Trybe DLC threaded barrel
OEM Sig Sauer X-RAY3 sights
OEM Compact/Carry Sig Sauer slide, Compact grip module, and FCU parts