Vortex Cantilever 30mm Ring， Lower 1/3 Co-Witness， 1in Offset for StrikeFire CM-304<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"> n/a </span></li><li><span class="a-list-item"> Imported </span></li><li><span class="a-list-item"> Provides lower 1/3 co-witness mounting height of 40 mm. Will work with most 30 mm red dot sights. </span></li><li><span class="a-list-item"> Provides extra rail room for rear Back Up Iron Sights (BUIS) when using the StrikeFire red dot along with the VMX-3T magnifier </span></li><li><span class="a-list-item"> The cantilever ring will move the StrikeFire forward about one inch </span></li><li><span class="a-list-item"> Weight: 4 ounces / Aluminum construction </span></li><li><span class="a-list-item"> Covered by the Vortex VIP Unconditional Lifetime Warranty </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31JwcriL%2BrL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31JwcriL%2BrL.jpg" noproxy>