Browning 12522 Picatinny Rail Matte Black Aluminum Fits X-Bolt Long Action 20 MOAHigh strength aluminum alloy 1913 Picatinny base, attaches to the receiver with 8 screws. Compatible with both Weaver style and Picatinny style rings. Getting more out of the phenomenal accuracy of the X Bolt. Reports from shoots all across the world confirm that today's X Bolt rifle is an incredible shooter capable of incredible accuracy. For those of you looking to reach out a little bit further, this high quality base provides you a solid lock up