There is a wide range of heavy buffers available, starting with the 3.8 oz.proves useful with associated gas systems and various supported ammunition types. There's a 90% chance you need a carbine size these days. Not locking back, or running into other malfunctions? Drop the weight down one, and check again.įirst, make sure you have the right size. Does it? Step up the weight a little bit. Load a single round, and check to make sure it locks back several times in a row. It will prevent the AR-15 from cycling, leading to improper extraction and ejection.Ī good rule of thumb is to find a buffer weight that allows your rifle to lock back on an empty magazine every time. But an overly heavy buffer isn’t good for a rifle, either. The entire action becomes smoother, especially the felt recoil. With a heavier buffer weight, the BCG encounters more resistance rearwards. The gas port in your barrel is fixed, and whileĪdjustable gas blocks exist, the majority of tuning is going to lie in your buffer system. If you have ever heard of someone "tuning" a rifle, altering the buffer weight and springs is how seasoned firearm builders accomplish this task. This chart provides a good reference for how tuned your rifle is In short, you get a rifle that you can shoot better, and last longer, just by tuning a few weights Whats not to love? This also helps increase lifespan of internal parts by reducing excess wear. If your rifle is properly tuned, you'll be taking less gas to the face, and the muzzle will be staying flatter through the recoil cycle, as the violence of the action is managed. Most commonly is recoil management, and reducing gas-blowback. The military has their set weights for the carbines & rifles, and it wasn't until the civilian market started playing around with different buffer weights & spring tensions that people even started talking about this more.Īssuming reliability isn't one of your current struggles (rifles are typically test-fired before they leave the factory), there's still a variety of reasons you might want to change out the buffer weight. It's a spring and weight combination, that until the past 20 years, went largely unchanged. Of all the parts in the AR15, this is about the simplest.
The buffer & buffer spring is what it's pushing into, and what returns the BCG forward, stripping and loading the next round. Gas pressure is forced up a gas port in the barrel, down a gas tube, and into the gas key in the bolt-carrier group (BCG), to push the BCG rearwards, extracting the fired round.
Nobody can even see you spent the money, and we all know looking cool is what actually matters.īy now, you should be familiar with AR-15 gas systems. Plus, it's not as exciting to research and swap out as a new optic, muzzle device, or weapon light. Why? Because it's hidden inside the receiver extension/buffer tube. Of all the rifle components going into an 80% AR-15 build, the most overlooked is the buffer weight. However, your buffer weight, and buffer spring, are some of the most important factors not just in how reliable your weapon is, but in how nicely it shoots as well. There's a good chance you've never even taken it out. If you're not building your own rifle's, chances are you haven't ever considered the buffer wight in your rifle.
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