I dont know the maker of my scope mounts,I let the gunshop install it for free,since I bought the gun and scope there and they have a 3 foot long barrel alignment tool that insures that your scope is in perfect alignment with your barrel.The receiver is grooved for standard 22 mounts,the ones I got cost about $20 they tighten up to the receiver on both sides so you can get better alignment than with weaver style or other mounts that have only screws on one side,other than that they are standard mounts.This gun is very accurate and not cheaply made,but it doesn't cost much more than a lot of other 22's.I also checked my owners manual and they don't offer the 22wmr in the varmint model,but the barrel on the 452 american isn't skinny it's about average.Hope this helps.