Then there’s this http://762sass.com/product.php?p=569&cid=7&session=5c766934ce614f049f2f9b3fcbb9afe1 which just confuses me. For future reference, if you get your money back and still want a Magpul UBR (they are awesome Magpul Stocks)……….AIMSurplus sells them for $199 shipped with a discount code: http://www.ar15.com/forums/t_2_217/185369_current_coupon_codes.html Excellent post. I’ve been deciding on going with a more traditional M4 type telemagpul Stock or a Magpul UBR,,,,I think I’ll opt up for the Magpul UBR. Not really proprietary, as there are other Magpul Stocks from different manufactures that also use this tube such as the Sully magpul Stock. Originally Posted By metroplex: The Magpul UBR is heavy. I put that lower on my 16″ M4 and although it is balanced, it feels very heavy compared to my SCAR 16. I only use the Magpul UBR with my 24″ HBAR setup, which is already heavy. I can’t fathom using the Magpul UBR with a SBR. I love it on my PSD, it balances it out excellently paine