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Build Your Own Buffer
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The MSRx online store maintains an inventory of various buffer weights; hard cast, tungsten, steel; so you can mix and match to achieve your desired sliding buffer weight, as well as pre-measured quantities of both lead and tungsten shot for building loose fill dead blow buffers.
Select the type!
We inventory all of the typical buffer body types; PCC, rifle, carbine. Each comes with the buffer bumper as well as the roll pin, ready to assemble.
You build it?
Assembling a recoil buffer is as simple as completing a jigsaw puzzle. Easy DIY!
The color of the buffer body, as well as the bumper, may vary.
Select the fill!
Whether loose fill dead blow, or sliding weights, there are options. Each of our sliding buffer weights will include a rubber spacer pad.
We build it?
Don't have the time, or desire, to DIY? Many variations are available in the online store.
Single Buffer Weights
We carry buffer weights of all types, so folks can mix and match to reach the desired buffer weight. Three hard cast buffer weights are equivalent to two tungsten weights, so there can be a significant cost savings.
Hard Cast Weights
We cast buffer weights in four lengths; 1x (same length as a typical steel weight), 1.5x, 2x and 3x. It costs less per ounce to pour a longer mold, and with no data indicating that multiple smaller weights (and spacer pads) offer any advantage over a larger one regarding "dead blow effect", when maximum mass is desired - some of those spacer pads may be eliminated.
Tungsten Loose Fill
If you desire a true dead blow buffer, loose fill shot is the answer. Loose fill tungsten will not be as heavy as a solid tungsten weight, due to airspace between the pellets, but it is still about 50% heavier than steel weights.
Lead Loose Fill
If weight gain is not a concern, but dead blow is, loose fill lead shot may be the answer. While lead is typically 50% heavier than steel, airspace surrounding the pellets results in about 15% less total mass than steel, within the same buffer cavity.
Loose Fill Weight
Pre-filled bags of loose shot are measured by the size of the buffer cavity, based on how many solid weights it can contain, while leaving just enough room for the movement required for dead blow. A 2T/2L = AR-10 carbine buffer, a 3T/3L = AR-15 carbine, a 4T/4L bag = A5 length buffers, the 5T/5L = AR10 rifle as well as the reduced cavity AR-15 rifle buffers, and a 7T/7L bag = AR-15 full cavity rifle. If you wish to combine solid weight(s) with loose fill, subtract the number of solid weights from the cavity size to determine the size of bag needed to complete the fill.
The MSRx online store inventories the various buffer body kits shown below, shown with the weight of each assembly. A buffer bumper and roll pin are included so all that is necessary is to add the fill.
Below each of the buffer kits is a list of 'recipes' that can be used in order to achieve a particular buffer weight for that particular buffer type, from ingredients that are available in the online store.
We wrote the recipes, all you have to do is select the ingredients!
S=Steel H/C=Hard Cast T=Tungsten
A mil-spec AR-15 rifle buffer contains an aluminum spacer and 5 steel weights, so the actual cavity is 7 deep. If maximum flexibility is the objective, these are the buffer bodies that you want.
Some manufacturers are eliminating the aluminum spacer and short throating the cavity. It is advisable to disassemble your buffer prior to ordering to determine how much space you have to work with.
A typical AR-10 rifle buffer has the same size cavity (5) as a short throated AR-15 rifle buffer, and weighs a hair over 5 oz. Just swapping the steel weights for hard cast would add about 1.5 oz.
AR-15 Rifle Buffer, 7-cavity.
AR-15 Rifle Buffer, 5-cavity.
AR-10 Rifle Buffer
An A5 style buffer cavity accommodates 4 buffer weights. This type of buffer was designed for use in an AR-15 with an extended buffer tube, but they also work in an AR-9 with a standard carbine tube.
The dedicated 9mm PCC buffer body is extended 3/4" to allow for the shorter bolt assembly. Our PCC buffer body kits have a 4 deep cavity. If re-filling your existing buffer check to see what you have.
A standard AR-15 carbine buffer tips the scale at 3 ounces, with 3 steel weights. Simply swapping your 3 steel for 3 hard cast weights will make it an H1. The 2x hard cast + one tungsten = H2.
A5 Style Buffer
AR-9/PCC Buffer
AR-15 Carbine Buffer
The heaviest of the three AR-10 carbine buffer body kits available, with extra thick walls and steel construction to maximize weight. This AR-10 carbine buffer cavitity is 2 deep and has a phosphate finish.
Machined from stainless steel for long term durability, this AR-10 buffer body is built to last, albeit slightly lighter than the phosphate bodies. The cavity accommodates 2 weights, or 2T/2L loose fill.
There are situations when less mass is actually more desireable, and there is an aluminum AR-10 carbine buffer body that can help make it happen. With a 2L loose fill bag you would be at about 1.9 oz.
AR-10 Carbine Buffer, Phosphate
AR-10 Carbine Buffer, Stainless Steel
AR-10 Carbine Buffer, Aluminum
Mix and Match
We pour hard cast buffer weights in a variety of lengths to give maximum flexibility of possible combinations. These stacks are for standard carbine buffers, but one can easily extrapolate for longer buffer body cavities. Swap tungsten weight(s) for 1x hard cast, for even more mass.
Symmetry vs Asymmetry
Without any data indicating any advantage of quantity of units vs size/weight of units, it makes sense to eliminate as much dead space as possible (such as rubber spacer pads). The cost per ounce is also reduced with the longer hard cast buffer weights, as opposed to typical 1x lengths. It doesn't take much more time to pour a 2x or 3x buffer weight than a 1x, so the main difference is in the material cost. A lone 3x will fill an H1 buffer for a lot less than the cost of three 1x weights, and you gain a little extra mass due to the reduction of the rubber spacer pads.
If your rifle buffer has an aluminum spacer, as shown, you can add even more weight, but some rifle buffers are not bored full length. One can further tune buffer weight by swapping steel or tungsten with hard cast 1x weights.
