2pcs Scope Mount Rail Adjustable Adapter 20mm Picatinny to 11mm,Mini Rail convertor Aluminum Alloy Lightweight

Perfect adapters to mount on a 11mm rail so you can run 20mm picatinny/weaver type scope rings instead of your standard 11mm, 3/8inch dovetail. The 20mm rings just mount alot more sturdy then the 11mm dovetail.

I've used these in particular and this type of adapter in general on a variety of airguns. They snap right in the base of the Weaver/Pic-style ring and grab the skinny rail when the ring is tightened down. This particular make has a small vertical set screw that I've had to generally remove, I think it's for use as a recoil stop, just generally gets in the way with a continuous rail, not needed for pneumatic and PCPs. Not sure how well these inserts would work with springers. No instructions included. I make sure the short side is next to the rings' base clamps, seems to work smoother that way. This style adapter can be had from a number of vendors, this one was cheapest at the time and seems to be quality made. Have had more expensive name brand ones in bubble packs, can't see a difference. With some makes of guns, the 11mm rail is a little wider than that, I've had to disassemble the ring base clamp, put the ring and adapter on the rail and then reassemble the clamp. Not the adapter's fault, there's no real standard on those rails. This adapter does widen the variety of rings that can be used and also allows the use of optics that only have integral Pic bases. Can also be used with US-style 3/8" .22 mounts.

It fits the mount that I needed it for but it is impossible to keep it tight. It is intended to fit as a shim between two very specific widths and it does not provide a good grip on either surface.

Using on a Springer Air Rifle works extremely well to mount a scope or red dot. Tried them both, have had no problems and may purchase another set. They great to see if you might like a different scope before investing in new mounts. Good mounts aren't cheap and this is a decent alternative and in some cases the only way you'll get anything mounted. Very handy.

The mounts are difficult to attach to the rail on the gun

Used to adopt 11 mm or 3/8 groove to Weaver base, without the scope being to high as with the usual adaptors. Worked well on my pellet gun.

Wish I woulda went with the more expensive one. Bough this for my sons .22 and he said he no longer put them on and they broke into pieces. Definitely plastic and not the best as far as anything goes really. Not functional due to breaking, they got but were so hard to install they broke upon installation. Disappointed.

Work fine but - nice and slim but not for precision mounting scopes.