AR-15 H2.5 Carbine Buffer (5.1 Ounces) Here is the perfect balance between and H2 AR-15 Buffer and an H3 AR-15 Buffer. When using super safeties and FRT's, it is very common to need a heavier buffer in your firearm. Well, we believe with the 2.5 you have the perfect balance because the H2 is 4.8 ounces and the H3 is 5.4 ounces therefore splitting the difference right in the middle of 5.1 with a solid construction has shown to be a very effective weight. THIS MAY/MAY NOT work great for your set up, the heavier solid non reciprocating buffers like this are meant more for pistols and not rifles. It&';s a great buffer for the buy but it is not the same as reciprocating H2 or H3 This heavy carbine collapsible stock buffer assembly provides smoother function and helps to noticeably reduce felt recoil. Product Specs: Steel Construction 3.25" OAL Standard Carbine Length 5.1 OZ +/- .1 oz Solid Steel Buffer Weight