Midwest Industries Flip-Up Front Sight Gas Block Height， Black<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Super smooth ball bearing pivot detent </span></li><li><span class="a-list-item"> Uses standard A2 front sight post </span></li><li><span class="a-list-item"> Hard coat anodized 6061 aluminum construction </span></li><li><span class="a-list-item"> For guns with gas block height rail </span></li><li><span class="a-list-item"> Folds to the front </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41lvL4ox2dL.jpg" noproxy>