Description
This is our standard AR-15 Mil-Spec carbine buffer tube/receiver extension castle nut
Features:
- 4140 Tool Steel construction
- Phosphate finish
- Fits: AR-15 or LR308 Buffer Tubes
PRODUCT SKU: BKF-CN
Save $0.68
Current price is: $2.76.
15% OFF In Cart!!!
BKF Mil-Spec AR15 OR LR308 (DPMS) Receiver Extension Castle Nut Mil Spec
Original price was: $3.44.$2.76
or 4 payments of with 
2952 in stock
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Jonathan (verified owner) –
Everyone needs a castlenut and this one worked fine.
Ryan Seawood (verified owner) –
Very good products
Kim Williams (verified owner) –
It’s a nut. What can I say. It worked.
JOHN (verified owner) –
Castle nut works good
Casey S. (verified owner) –
Great product, fast shipping!
Shaun (verified owner) –
A+++
Eric Harrison (verified owner) –
Great company to get your ar stuff from!
Richard Sellards (verified owner) –
Excellent
Stephen H. (verified owner) –
Works great!
Freddie (verified owner) –
Milspec
Jay Ratusz (verified owner) –
Its a nut
Patrick C. (verified owner) –
Looks good
Robert K. (verified owner) –
Great to deal with
Sean (verified owner) –
Great deal
JOSHUA KONEY (verified owner) –
Fits and functions like it should
Kevin (verified owner) –
As advertised.
Morgan C. (verified owner) –
The highest quality finish on a castle nut that I have ever seen.
Ronald Keylon (verified owner) –
Product was as described.
Brendan (verified owner) –
As advertised, no machining flaws, threaded on flawlessly.
Dave M. (verified owner) –
Good fit
B Kent (verified owner) –
I bought these to have as spares.
Daniel (verified owner) –
Anonymous (verified owner) –
As expected
Scott Schoenfelder (verified owner) –
Nothing fancy for good price.
Jason M. (verified owner) –
Worked like a charm.
Paul F. (verified owner) –
Good quality, good price.
Robert M. (verified owner) –
This was a add on item, good price local shop wanted $7 for one I paid $2.50 at B. King’s. Works as good as any other castle nut I have used.
Scott S. (verified owner) –
Exactly as described, perfect fitment
Jay Grimsrud (verified owner) –
No problems here!
Jason Warren (verified owner) –
Product was perfect, shipping was great and fast. Overall happy and will order more in future as I build!
Garrett (verified owner) –
Got the job done at a good price
Pedro Carrero (verified owner) –
Awesome costumer service and great products. Best place to but all the stuff I need.
Anonymous (verified owner) –
Fit my new build great. Feels pretty durable.
Steven N. (verified owner) –
Easy call, LIKE ALL purchasesfrom B. KING! Thanks! Fit and finish PERFECT!
James Brady (verified owner) –
Anonymous (verified owner) –
Lane t. (verified owner) –
Prompt shipping
Christopher Ohneck (verified owner) –
Manuel M. (verified owner) –
Great item
Shawn Q. (verified owner) –
Nikoli (verified owner) –
Ryan M. (verified owner) –
Smooth threading on my sba4 buffer tube.
Anonymous (verified owner) –
Does its job
Anonymous (verified owner) –
Alexander M. (verified owner) –
Rogel (verified owner) –
Nothing special, just a castle but. Would it love to be more like black anodize as it looks on the picture.
Justin H. (verified owner) –
Good Mil-Spec Castle Nut.
Anonymous (verified owner) –
William C. (verified owner) –
Good price
Dakota Shira (verified owner) –
Christopher T. (verified owner) –
Anonymous (verified owner) –
Nathan (verified owner) –
They seem good to go.
David W. (verified owner) –
Works Perfect – good price and fast shipping, as usual
David B. (verified owner) –
Brett L. (verified owner) –
Anonymous (verified owner) –
good price for quality product, fast shipping
B.C. Jones (verified owner) –
Everything went well good product. Shipping could have been faster.
Mike Wentworth (verified owner) –
Justin Novosel (verified owner) –
Dustin Mooring (verified owner) –
Raymart D. (verified owner) –
Item as described
Troy O. (verified owner) –
Works as expected will buy more
George Potter (verified owner) –
John S. (verified owner) –
Thick anodized quality part priced great and….IN STOCK during crunch time. Thank You
Anonymous (verified owner) –
ROBERT (verified owner) –
Arrived fast. Great company
Anonymous (verified owner) –
A good product, shipped quickly.
Mike G. (verified owner) –
Right part perfect price
Mike jensen (verified owner) –
Kalman K (verified owner) –
Matthew W. (verified owner) –
John S. (verified owner) –
Had Zombie Tigerstripe C-koted. Great price, service is no nonsense. A Plus every time
Chris Allen (verified owner) –
Not much to say, it’s a buffer tube castle nut, it works. Price was good, but shipping (ridiculous) was more than the castle nut. But, I needed the part and the these guys were the only ones to have them in stock.
David Hackenberg (verified owner) –
Anonymous (verified owner) –
Dan (verified owner) –
Carlos G. (verified owner) –
Great price and quick shipping.
Anonymous (verified owner) –
Mike G. (verified owner) –
Joshua Provost (verified owner) –
It’s round and black and holds a buffer tube on.
Paul smith (verified owner) –
Worked perfect .
Anonymous (verified owner) –
Robert (verified owner) –
Just as described , timely delivery, fits well, very happy with purchase.
Anonymous (verified owner) –
Fast service
Sean H. (verified owner) –
It worked great
Steve B. (verified owner) –
Perfect fit
Paul F. (verified owner) –
Works great
Anonymous (verified owner) –
Very pleased with fit and finish and price this is a good buy super fast at getting the order out good stuff cheap! Also has notches for staking
douglas bryant (verified owner) –
Steven Neal (verified owner) –
Great product and FAST shipping!
Jason Adams (verified owner) –
Great price, and fast delivery
Albert (verified owner) –
Trevor Peters (verified owner) –
Kevin (verified owner) –
Adam J. (verified owner) –
It’s a castle nut, it works as it’s supposed to
David K. (verified owner) –
Great product packaged along with another order both arrived sooner than expected. Thanks again
Anonymous (verified owner) –
Thank you
Bryan Johnson (verified owner) –
Quality Product shipped on time
gerald yabeny (verified owner) –
Joe (verified owner) –
Very happy with the quality (as I always am). No burrs or out of spec edges. Could not be more pleased. Shipping was super fast and communication and order placement is top notch, as always. Thank you!
Brandon S. –
Joseph Dobson (verified owner) –
Ian A. (verified owner) –
Excellent quality for an excellent price.
Dean (verified owner) –
This nut actually seemed a little heavier and threaded easier. Might just be me, but it just seemed to be a smidge better than I’m used to.
Tim S. (verified owner) –
Fast shipping and great prices
Andy Rivera (verified owner) –
Great service in shipping and love the finish. Exactly what I need. Will be ordering more.
Dustin C. (verified owner) –
Zach Moore (verified owner) –
THOMAS DAVIS (verified owner) –
Anthony (verified owner) –
Paul Heston (verified owner) –
High quality, great price and fast service.
Joshua M. (verified owner) –
Good quality stuff, shipped out right away!
Kenneth R. (verified owner) –
Good for price but color is off compared to my receiver.
blake king (store manager) –
Phosphate vs Anodizing
ALAN D. (verified owner) –
Great deal
Anonymous (verified owner) –
haven’t used any parts yet just received
Kevin P. (verified owner) –
Exactly as described, will be a return customer for sure!!!
Daniel (verified owner) –
Great product, price and shipping. Very satisfied.
Chris Myers (verified owner) –
Awesome seller super quick shipping
Gerald Yabeny (verified owner) –
david miller (verified owner) –
Arrived very fast! Product was as expected. Great price!
Thomas (verified owner) –
Nice finish, fits perfect, you will be satisfied
Brian H. (verified owner) –
philip cole (verified owner) –
outstanding transaction
Dan M. (verified owner) –
I never ordered from B. King’s Firearms before however when I was searching around for a castle nut for a project firearm I ran across B. King’s Firearms and decided to give them a shot. The ordering was easy online like other retailers and their email communication was extremely prompt. I had an order confirmation in seconds and a shipping confirmation within 24 hours. I would definitely order from them again!
Anonymous (verified owner) –
Frank B. (verified owner) –
Perfect nut, really beyond mil spec and was priced well too. Very happy !
Anonymous (verified owner) –
Anonymous (verified owner) –
Fast shipping, low cost, and quality
Alfonso (verified owner) –
Good
David (verified owner) –
Justin D. (verified owner) –
Robert W. (verified owner) –
Very nice. Thank you.
John Kent (verified owner) –
David M. (verified owner) –
Shipping was extremely fast. They were only ones with the part for such a great price. 10/10 will order again and again
Garrett K. (verified owner) –
Fit as advertised
Shane Allen (verified owner) –
Great product, great shipping time
Thomas Burnett (verified owner) –
James F. (verified owner) –
Gary A. (verified owner) –
Made of good steel, mil spec, functions well
Jose Lopez (verified owner) –
Justin DeMontier (verified owner) –
Von (verified owner) –
craig felger (verified owner) –
michael s. (verified owner) –
Arrived earlier than expected and everything looks to appear in good working order. Haven’t had a chance to use it yet but will definetly order again
Robert wylie (verified owner) –
David (verified owner) –
Ryan (verified owner) –
Jerome Thompson (verified owner) –
Juan Vazquez (verified owner) –
James Love (verified owner) –
bryant (verified owner) –
Donald A (verified owner) –
Work like they should. Can’t ask for more than that.
Anonymous (verified owner) –
Shipped quickly and seems to be good quality
Al (verified owner) –
Fabian Sanchez (verified owner) –
Superb Quality, Great Price, Will Shop again
STEVEN R. (verified owner) –
Jeff B. (verified owner) –
James L. (verified owner) –
Very good quality and very good finish definitely recommend others to buy this product .
Richard M. (verified owner) –
Exactly what I needed. Quick shipping.
Peter (verified owner) –
Fast shipping. Product was as described.
Ben M. (verified owner) –
Brian B. (verified owner) –
exactly what I needed at a great price
G W. (verified owner) –
Nice part at a great price.
Quentin (verified owner) –
Price and quality as advertised.
Mike (verified owner) –
Anonymous (verified owner) –
Anonymous (verified owner) –
Anonymous (verified owner) –
Danny (verified owner) –
Excellent communication and speedy service, highly recommended.
matthew younkin (verified owner) –
JOSH K. (verified owner) –
Excellent parts and very fast to ship!
charles watson (verified owner) –
Tim G. (verified owner) –
Works for what I needed it for.
Robert Gulley (verified owner) –
Good quality, just as good as anyone. Would buy again
William N L. (verified owner) –
Good parts, good fitment
Shane Phillips (verified owner) –
Paul L. (verified owner) –
Great product and great service
Barry Crocker (verified owner) –
David G. (verified owner) –
Worked perfectly and looked great.
Barry C. (verified owner) –
Great quality and fast shipping!!
Michael (verified owner) –
Does the job
Greg (verified owner) –
Marlin M. (verified owner) –
Always good stuff, always quick shipping
Anonymous (verified owner) –
Good fit & finish @ a great price. Solid value component.
Blake (verified owner) –
Elbert Palmer (verified owner) –
Very satisfied with these items at a great price!
Michael Earley (verified owner) –
Fast and affordable
Chris M. (verified owner) –
Steven W. (verified owner) –
Philip S. (verified owner) –
Nice Part.
Sam B. (verified owner) –
Great product. Ended up not needing it but kept it anyways because of the quality and price.
Rollin Workman (verified owner) –
Great
Steven W. (verified owner) –
Mike G. (verified owner) –
Daniel Filippini (verified owner) –
As always, good fair prices. Quick shipping. You folks are my first stop when looking for something for my ar
Paul Head (verified owner) –
charles watson (verified owner) –
David (verified owner) –
Nice
Mike (verified owner) –
Common part that works as intended. A+
Anonymous (verified owner) –
John D. (verified owner) –
It does what it’s intended to do I wouldn’t order it from here solo but if you’re already placing an order in need a couple might as well add them
Scott Serwacki (verified owner) –
What Castle Nut? Deez Castle Nuts!
John Mattingly (verified owner) –
Douglas Reed (verified owner) –
Luke (verified owner) –
Kyle (verified owner) –
Fit and finish perfect!
Anonymous (verified owner) –
Seth S. (verified owner) –
Greg O. (verified owner) –
Bryan G. (verified owner) –
Robert S. (verified owner) –
Anonymous (verified owner) –
john e rodeck (verified owner) –
Bryan G. (verified owner) –
Steven W. (verified owner) –
Good quality at great price
Moises (verified owner) –
Yall are the best hand downs and your products are great I recommend y’all to everyone I talk to woot woot
Jacob W. (verified owner) –
Price point and shipping speed speaks for itself. Quality finish.
Anonymous (verified owner) –
Anthony Rollins (verified owner) –
Andre Parker (verified owner) –
Jacob Ceglinski (verified owner) –
John R. (verified owner) –
MICHAEL KIRK (verified owner) –
Moises Juarez (verified owner) –
Product rocks
Blake Heinz (verified owner) –
Anonymous (verified owner) –
Robert Doyle (verified owner) –
Bobby (verified owner) –
It seems a bit beefier that others.
Bradley B. (verified owner) –
Moore (verified owner) –
Great price
David S. (verified owner) –
Mil-spec castle nut, made identical to the 12.00 plus items.
Franklin Perez (verified owner) –
Scott Bradley (verified owner) –
Damian Clark (verified owner) –