Buckrail makes some pretty nice stuff for the 13xx’s. He sells an adapter with a moderator that will replace the front sight that will really quiet it down. Not that they all that loud but it should make it real stealthy quiet with the moderator. He also has a fatter forearm for a little nicer pumping.
He also makes the type of scope mounts your looking for and his stuff is pretty reasonable in price.
He’s a veteran owned business and I’ve been impressed with the few parts I ordered from him.
Custom Airgun Accessories
buck-rail.com
The plastic 1399 skeleton stock might sit a little low when using a scope. At least it is for me. This cheek riser works pretty good to get good eye alignment with a scope and doesn’t cost a bunch. It just clamps on. I have one that I don’t use and I’ll send it to you if you want. Just send me a PM.
Shop Advanced Technology International's Comfort and Sighting Improving SKS Cheekrest at ATIoutdoors.com
www.atioutdoors.com