tech sights ts200 adjustable aperture sight for the sks rifle steel base tech sights does not require drilling or tapping to create a solid mount to the receiver. mounts the sight closer to the shooter's eye, giving the shooter a sight picture similar to the gi rifles. increases the sighting radius by 10" over sights mounted in front of the receiver. returns to zero after removal. uses incremental windage adjustment with rugged detent locking. sks sights mount solidly to the receiver and are not affected by the movement of the receiver cover. the ts200 includes an elevation adjustable aperture (.062 dia.) with detent locking. the sight base is constructed of high strength steel and anodized to military specifications. patented design. compatible with ts211 sight adjusting tool (asin: b0086t8ivu), sks tool (asin: b018015jga) and iras aperture inserts(asin: b00anwvaay). (not included but also available on amazon) manufacturer product guarantee the tech-sights ts200 has been designed to be a quality accessory for your firearm. if any part of the ts200 should fail due to normal usage or manufacturing defect, we will replace the part(s) at no charge to the customer for a period of one year from the date of purchase. also available amazon for the sks is the ts100 asin: b00t5hmv06 (simple and quick combat style short/long range flip aperture). both the ts200 and ts100 have advantages depending on the shooter preference. for install some sks models have the latch pin is brazed in place. this may make more difficult to remove, it can be done at home if handy, but some people prefer a gunsmith in some cases.