These are incredibly reliable sights and easy to install and operate.
<br />They fit on all 20mm rail and lock easily into place. And yes they are sight able. 
<br />This products are designed for Airsoft, but can be used on rifles.
<br />Professional and Simulation Training purposes.
<br />Material: Resin
<br />Color: Black
<br />Single size: 6.5 x 3.5 x 2.1cm