Details
Details
Reduce felt recoil and improve cycling reliability with the Spike's Tactical ST-T2 Tungsten Heavy Buffer 4.0 oz. This heavier buffer slows bolt carrier velocity, helping tame over-gassed systems and deliver smoother, more controlled shooting.
The Spike's Tactical ST-T2 Tungsten Heavy Buffer 4.0 oz is a carbine-length buffer designed for AR-15 platforms using carbine receiver extensions.
Heavier mass slows bolt carrier velocity for reduced felt recoil and less bolt bounce.
Increases dwell time, improving extraction reliability in over-gassed or suppressed setups.
Direct drop-in replacement for standard carbine buffers with no modifications required.
- Type: Heavy Heavy Carbine Buffer
- Length: 3.25"
- Fill: High-Density Tungsten Powder
Compatible with AR-15 and AR-10 platforms using Mil-Spec or commercial carbine-length receiver extensions. Also fits 8" GI-spec AR-10/AR-308 receiver extensions.
Precision machined to mil-spec dimensions for reliable fit and consistent performance. Built from durable materials to withstand years of regular use.
A reliable choice for standard AR-15 carbine builds, replacement parts, and new builds using carbine-length gas systems with 16-inch barrels.
Spike's Tactical is a veteran-owned manufacturer of AR-15 rifles and components, known for innovative designs and dependable performance trusted by military, law enforcement, and civilian shooters.
California Prop 65 warning
WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to www.P65Warnings.ca.gov.Ratings & Reviews
243 reviews
No clanking when tipping rifle
by JC Flag
When walking quietly through the woods, ever tip your rifle and hear a faint clank? That's the weights inside the buffer. Not with this buffer. The powder used eliminates that noise. During shooting the recoil impulse is smooth. Only reason it gets 4 stars and not 5 is I've had the roll pin back out on an ST-T2 recently. Caught it before any damage to the receiver extension.
Best buffer available without going to exotics
by Samuel Green
What's not to like? no more balls bearings and springs noises and smooth action.Add in Primary Arm's good pricing and uber quick shipping and you end up ....happy happy happy
Outstanding Product
by Joe Sarmiento
What can I say that has not been said before, it's a Spikes brand!!!..😂😂
Smooth
by Big Daddy
Very smooth action so far I have one on a 9mm AR and now a 14.5" 5.56mm Colt SOCOM AR I'm building. No noise from the weights inside. I didn't hear that sprung sound usually from ARs which is attributed to the action spring. It could of course be the 9mm and I will be able to tell once I have the Colt together.
Good
by Remeiko Brittain
Very smooth
Spike's buffer
by David
Very happy with this heavy buffer. And they are right, this one just looks cool too.
Spikes ST-T2 Tungsten Heavy Buffer
by rick nielsen
Used these on 5 builds exellent fast fast shipping
ST-T2
by Thomas G
This thing is great. Now my go-to carbine buffer. No other buffer on the market looks more awesome, but that's not what matters. Every shot with this feels like it came out of a bolt gun. What I mean is you can hardly even feel the bolt cycling anymore with the tungsten powder in place of moving weights. A standard carbine buffer coupled with a stainless spring felt like "chungchung" with every shot. Now with the Spikes buffer and a chrome silicon spring its as smooth as it could be. The weight, I believe, is optimal.. Plop it in and shoot. This is really something else. Pick one up guys, you can't go wrong. Good luck to you all.
Spike's ST-T2 Tungsten Heavy Buffer
by William Luke
This new buffer works great, should have done it sooner
Spike's ST-T2 Tungsten Heavy Buffer
by Keith Singleton
This isn't the first item I have purchased from Primary. The ship speed was fantastic (ordered and it arrived two days later) and the customer service is also fantastic.The buffer is great looking when not installed. Installed, you can't see it but you know its there when you fire the weapon. Tried the stock buffer with 55g and 65g (.223 and 5.56) rounds in rapid fire. Installed the T2 and performed the same testing. The T2 definitely smoothed out the action. No hangups, FTF or FTE. It is smoother but you will still hear some spring noise if using a stock spring. If that bothers you just get a flat spring. Otherwise I would highly recommend it.