The Industry Brand Field Rear Sight is a popular low cost, yet high quality upgrade for Crosman 1377 and 2240-type air pistols that are fitted with a steel breech.
This sight provides click adjustment for elevation and windage and is the correct height to match the front sight on these Crosman air pistols.
Archer Airguns is now supplying this sight with an additional sight leaf screw. This is because the factory screw is too long and can interfere with correct fitting onto scope rails. The replacement screw is the correct length and requires just a touch of black paint to blend in properly.
Some customers have also found that this sight causes their 1377
or 2240 pistols to shoot high - particularly at short range - although
most don't have this issue.
A couple of solutions to this are described in these blog posts:
http://www.archerairguns.info/search?q=1377+pistol and http://www.archerairguns.info/search?q=crosman+2240+sight+mod