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As a result, they will feel “smoother” when the gun is cycling and reduce the shooter’s felt recoil. Heavier buffers take more energy to move rearward when compressed and use that energy much faster, slowing down more rapidly than lighter options. The prize that everyone is chasing after is the heaviest buffer that can be used while the gun still cycles completely, extracts and ejects properly, and chambers the next round in the magazine. So why are there so many options for buffers and springs? AR-15 Buffers and Buffer Springs – Achieving the Ideal SpeedĪs stated previously, many variables affect which buffer is the perfect choice. The compressed spring then makes use of the kinetic energy it has built up to push the bolt carrier forward towards the muzzle end, chambering the next round and making the gun ready to fire again. This causes the bolt carrier group to contact the buffer, compressing the buffer spring and sliding the bolt carrier group into the receiver extension partially. When the gun is fired, gasses travel through the barrel, into the gas block, back through the gas tube, and push the bolt carrier group towards the gun’s rear. The proper buffer set up for a gun can aid in reducing recoil, smoothing out the action of cycling the gun, and making it more enjoyable to shoot. The buffer system’s primary function is in cycling the bolt carrier group when the gun is fired. AR-15 Buffers and Buffer Springs – What Does the Buffer System Do? Keep in mind, that generally carbine buffers and springs will be used with carbine receiver extensions with most collapsible stocks, while rifle length buffers and springs are used for A2 and similar fixed stocks with longer rifle receiver extensions. Rifle springs are between 11.75 inches and 13.5 inches. Carbine springs should be between 10.0625 inches and 11.25 inches in length, with longer springs offering more return power. Moving on to springs…Standard buffer springs come in two types, Carbine and Rifle. Finally, a Rifle buffer should weigh 5.1 to 5.3 ounces and is noticeably longer than the carbine varieties. An H3 buffer similarly should be between 5.4 and 5.5 ounces depending on the manufacturer. The H2 buffer has a slight variance depending on the manufacturer, but should be 4.6 to 4.7 ounces.
#H3 buffer full
Moving up in weight, an H buffer, or Heavy Buffer, is nearly a full ounce heavier at 3.8 ounces. A standard carbine buffer should weigh 2.9 ounces. They merely keep the buffer in place when the receivers are separated.ĪR-15 buffers comes in a few different weights and lengths. Additionally, a buffer retainer pin and spring are part of the system, but are not essential for operation. The buffer system in an AR consists of three main components: the buffer itself, a buffer spring, and a receiver extension (aka the buffer tube) to house it. AR-15 Buffers and Buffer Springs – What Does the Buffer System Consist of? The goal here is to explain how the buffer system works, give some information on which AR-15 buffers and buffer springs are typically best for different setups, and review and explain some of the aftermarket options.Īs with anything else in your gun, do your homework before you start swapping out AR-15 buffers and buffer springs, and make sure you have the setup that will be ideal for your gun. Today, you have an almost overwhelming variety of options. Add to this confusion is the sheer amount of aftermarket buffers, springs, and complete buffer systems.