Pistol caliber carbines such as 9mm, .40 S&W, .45 ACP, and 10mm are a blast to shoot but can be tough on AR-15’s internal components. Without a properly tuned blowback system, you run the risk of being overly destructive on internal lower parts. Running a blowback AR15 with a suppressor can further increase the risk for damage. In addition to a properly weighted buffer, the KVP Extra Power recoil spring is a must! The KVP XP 17-4 SS spring offers increase pre-load over standard springs. The additional preload helps increase the Blowback systems dwell time.
XP Spring Features:
- 17-4 Stainless Steel
- Use in 9MM, 10MM, .40 S&W, or .45 ACP blowback AR systems.
- Increases AR-15’s dwell time in blowback setups
- Increases Pre-load
- Quiets action (better for suppression)
- Reduces felt recoil
- Designed only for Carbine Length Stock and pistol kits.
Donaldo B (verified owner) –
not sure what more I can say about it other than it is… uh… a heavy spring.
Jacob Bankester (verified owner) –
Thomas Harrison (verified owner) –
Excellent just what I wanted
CHARLES WELLS (verified owner) –
Blackwood Gunworks. (verified owner) –
A must have for blowback AR’s your bolt key will thank you.
Always Armed (verified owner) –
Great quality and finish
Kurt Belchamber (verified owner) –
Great product keeps bolt carrier nice a quiet and softens recoil!! Must have blowback part!
Jason S. (verified owner) –
Fantastic product. Very good quality with a perfect price tag.
Robert Rose (verified owner) –
I purchased this item for a 40 & 45 caliber ar build I was doing. The stronger spring really helped with proper bolt function in the blow back system
randy barker (verified owner) –
lance harskjold (verified owner) –
This was for the 10mm build I’m working on now. have not tested, appears to be good quality, and is definitely stiffer than a standard carbine length buffer spring.
George (verified owner) –
This product keeps our instruments running flawlessly.
Max (verified owner) –
Used the xp spring with the 7.5oz buffer and couldnt be happier. Perfect setup for my 9mm AR.
David Murphy (verified owner) –
I used this to build a 9mm carbine along with the KVP 9mm Complete Upper and the KVP 10oz Tungsten blowback buffer. For the lower, I am using a mil-spec lower with a Hahn adapter block. the combination works beautifully. It is accurate and feeds any ammo, FMJ, Hollow points Etc. I highly recommend KVP.
Mike Lair (verified owner) –
Great service and spring worked great.
Judibelle Melendez alcaraz (verified owner) –
Steve D. (verified owner) –
Price point is in-line with other quality spring manufactures, quality is good only time will tell for long term performance.
Dacara (verified owner) –
Robert (verified owner) –
The spring runs great in a 9mm AR Pistol.
This would be a 5 star review but the shipping cost ($9.95) for a nearly weightless spring seems a bit much.
Ben Moore (verified owner) –
As ordered. Seems to be running good. Time will tell. Happy with this product so far.
Todd (verified owner) –
Shipped fast and in solid packaging to prevent damage to product. Excellent experience in ordering and receiving.
William Stypick (verified owner) –
Was a little nervous building my first 10mm AR pistol…. I did a little bit of research, saw some people complaining about problems with their builds… BCG problems… buffer weight problems, buffer spring problems etc…. so I decided to keep it all in the same family and bought the Kaw Valley BCG, 10oz Buffer and PCC Buffer Spring. Threw all my ingredients together and 500 rounds later… not a single malfunction! Been running 180gr JHPs and 170gr Flat Nose FMJs. I’m a happy camper!
Robert Singleton (verified owner) –
I have not used it yet …. I’ll let you know when I run it…
Danny Moore (verified owner) –
Recieved in quick order, exactly what I ordered. I am always happy with their service
Patrick Patrick Forsythe (verified owner) –
The part I needed was easy to find and shipping was very quick.
Kevin (verified owner) –
Have only put 20 rounds through it so far, no problems. Great product.
John Biehl (verified owner) –
bought along with buffer ..Perfect for my 9mm build ..couldnt be happier
manuel nogues (verified owner) –
Rodney Beaudrot (verified owner) –
Great quality extra power buffer tube spring. Feels really stout. Paired with a heavy buffer, it should be a great match for my 9 mm build.
Josh Stephens (verified owner) –
Upgraded to this stronger spring and heavier buffer for my 9mm ar that wasnt running good. It runs like a sewing machine now! Beautiful
Daniel Lachance (verified owner) –
Very nice Quality works very well fast shipping
Jalal Sinjer (verified owner) –
Dan Longo (verified owner) –
These guy have good friendly service and great products.
Justin Phillips (verified owner) –
Damien Chiappini (verified owner) –
Snake River Armory (verified owner) –
The only PCC spring I run. Shipped fast with professional packaging to prevent damage to products. Repeat excellent experience in ordering and receiving. Solid company.
Travis (verified owner) –
Very fast shipping. Product as described
Wallace Sparks (verified owner) –
Steven Pence (verified owner) –
Price was just right for such high quality parts. Shipping was quick and couldn’t be happier. Will definitely come back for future builds.
dave (verified owner) –
Great. Fast shipping
Gregorio Bracero (verified owner) –
I ordered 1 of these and received 2
Wade Van Hoose (verified owner) –
David Hope (verified owner) –
Add this to the 10oz Tungsten Buffer on a 45acp or 10mm AR.
Kevin (verified owner) –
My 9mm AR build was struggling to cycle with shooting subs while suppressed. A simple swap to this spring immediately fixed the issue and my endomag fed flawlessly all day. I couldn’t be more pleased.
Lefty Lawless (verified owner) –
I had previously bought 2.5 inch heavy buffer 5.6 oz for my 308 carbine.
So I knew that these springs would be a quality product as well
The 9mm AR performs flawlessly with these springs.
Kaw Valley Precision products are worth your hard earned money.
Chuck Fazekas (verified owner) –
Shipping was quick and works well with the 10 oz Buffer I purchased from KAW Valley. I will be using KAW Valley for more of my Builds.
Tony (verified owner) –
Timothy (verified owner) –
Stronger spring in a compact package (shorter than a .308 sprint) reduces felt recoil in my 9mm pistol caliber pistol. The AR-15 length spring allowed the use of a PCC extended buffer weight where longer .308 springs would not. Very affordable and delivered quickly to my doorstep.
cody hall (verified owner) –