This spacer was designed for the guy who already owns a 9mm buffer like the one offered by RRA or Colt and doesn’t want to replace it with another expensive 60-90 custom buffer. The ST-9BS does basically three different things for you that we’ll explain; It limits the travel of your 9mm bolt, helps eliminate the chance of breaking bolt catches, and makes for a much smoother shooting gun. Of course knowing us, it’s made from solid CNC machined 6061 billet aluminum with a black anodized finish for extra strength and durability. The reason why it’s better to have less bolt travel on a 9mm upper is that the 9mm cartridge length isn’t near the full length of a .223/5.56 cartridge so it doesn’t need the same amount of travel. All of this extra travel is just wasted energy and thus creates excess wear and tear on your expensive 9mm AR-15. This spacer takes up the extra space that isn’t needed in a 9mm AR and shortens the distance the bolt travels to the amount that it actually needs to travel. Bolt catches break on 9mm ARs due to the bolt having a running head-start on the bolt catch after the last round is fired. This puts excess pressure onto the bolt catch when it pops up and can cause them to break time and time again. Our spacer solves this issue by shortening the distance that the bolt travels thus not letting it get a running head-start on the bolt catch again. Because there is less distance that the bolt has to travel, you are going to be able to have faster follow up shots due to a shorter reset. Also, due to there being more spring pressure there will be less gas getting shot up into your face and more of it shooting out the muzzle which is an obvious plus. To Install the ST-9BS spacer you first simply remove your buffer and spring from the buffer tube. Then install the smaller side of the ST-9BS on one end of your spring like you would with a buffer and then drop in the complete unit into the buffer tube and start shooting again (the ST-9BS goes in first followed by the carbine buffer spring and then the buffer itself). So you basically want the spacer to be inserted all the way at the back of the buffer tube. If you have any of these issues with your 9mm AR or just want to make sure you never do, buy one of these spacers today and save yourself a lot of headaches and extra money that you could be spending on ammo. Specifications for Spikes Tactical 9mm Buffer Spacer: Manufacturer: Spikes Tactical Color: Black Condition: New Length: 9 mm Country of Origin: USA Features of Spikes Tactical 9mm Buffer Spacer: Weight: .82oz Package Contents: Spikes Tactical 9mm Buffer Spacer
5 reviews for Spikes Tactical 9mm Buffer Spacer
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Cdylan –
The spikes tactical buffer spacer fits and works perfectly, the action cycles faster and seems to take some of the slap out. Much cheaper than buying a new buffer and spikes spacer is made of metal and will last longtime unlike the cheaper versions made of plastic. I would definitely recommend this product for anyone with a 9mm ar.
popashot –
I'm using a standard AR buffer tube (inside length measured from back of buffer tube to retaining pin 7 1/16"), standard AR buffer and carbine spring and spacer will not allow the bolt to retract enough to engage bolt catch. Tried this spacer in two other ARs and same thing. Thought I could use the spacer instead of a stack of quarters in my AR9 build but just too thick. Be nice if Spikes could make a lightweight aluminum adjustable spacer.
Cheezer82 –
The spacer is too long. Does not allow bolt to travel far enough to engage the bolt catch. Seems to be well made but just doesn't fit. Waste of money, save yourself a few dollars and use about 2.25 in quarters instead.
ThyToaster –
A simple but very effective product. I bought two of these for my AR9's. It stops the bolt travel just behind the bolt catch. If you have a last round bolt hold open (LRBHO), it'll stop the bolt just behind the catch so it doesn't have enough room to hit the catch and break it. I put a couple hundred rounds through the gun with the spacer installed and it didn't hinder performance at all.
Wiebs41 –
My go to sight for buying anything online. Amazing prices and great selection .