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9" Skeleton Stock®
SS9RPMSRP Sale $174.95 - $364.85MSRPThe JMac Customs™ Skeleton Stock® 9" with Rise is designed for optimal performance and comfort, now featuring an integrated rubber buttpad for improved recoil absorption. It... -
SFG Skeleton Forward Grip
SFG-MSRP Sale $89.95 - $149.90MSRPThe JMac Customs™ Skeleton Forward Grip is a versatile grip that can function as both a forward grip and a handstop. The lightweight, reversible design provides superior control and comfort, making... -
8" Skeleton Stock®
SS8RPMSRP Sale $169.95 - $354.85MSRPThe JMac Customs™ Skeleton Stock® 8" with Rise is designed for optimal performance and comfort, now featuring an integrated rubber buttpad for improved recoil absorption. It... -
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Description
The ST Skeleton Tube replaces your standard buffer tube, allowing your stock to fold as flat as possible (with a compatible folding adapter). Made from lightweight, rigid 7075-T6 aluminum, it’s designed for use with most mil-spec M4-style stocks and braces. It features integrated QD sling sockets that remain accessible even with the stock fully collapsed.
Key Features:
- Adjustable Length of Pull: Select your preferred length of pull
- Compact & Functional: Offers a low-profile setup with easy sling attachment when stock is collapsed.
- Threaded holes for mounting bolt (included)
Note: All skeleton tubes except ST-7 can be adjusted up and down for height
Specifications:
- Crafted from 7075-T6 aluminum with
- Type III Hardcoat Anodizing
Attaching a stock to a pistol creates an SBR, requiring NFA approval. Follow all local/state/federal laws. JMac Customs LLC is not responsible for misuse of products.
ST Skeleton Tube
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Compatibility
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Weight
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5" (ST-5)
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Fits most M4 style stocks/braces
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2.9 oz
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6" (ST-6)
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Fits most M4 style stocks/braces
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3.1 oz
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7" (ST-7)
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Fits most M4 style stocks/braces
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3.80 oz
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7" Rise (ST-7R)
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Fits most M4 style stocks/braces
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3.90 oz
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FM-SM-1913
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MIL-STD-1913 Receivers and Adapters
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4.48 oz
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SM-4.5
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AK100 Series - 4.5MM Pin / Bulgarian|PSA|Riley
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1.3 oz
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SM-5.5
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AK100 Series - 5.5MM Pin / Russian|KUSA|Saiga
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1.4 oz
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SM-SF
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Arsenal SAM7 with Folding Stock
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1.02 oz
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FM-SM-MRKT
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JMAC IMR MRKT Receiver and MRKT Rear Trunnions
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5.28 oz
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Note: Some M4 style stocks use tension tabs designed for standard buffer tubes to mitigate movement. These will work on our Skeletonized Tubes however, you may experience some wiggle.
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JMac Customs™ offers Black, Green, and Tan finishes, uniquely formulated for our brand. Anodized colors may vary due to batch differences and lighting conditions, making each piece one-of-a-kind. Green and Tan are limited availability and may not always be in stock. By purchasing, you acknowledge and accept natural color variations.
Details
Length: |
Adjustable |
Stock or Brace: |
Both |
Rubber Butt Pad: |
No |
Folding or Fixed: |
Both Options Available |
Folding Butt Plate: |
No |
Adjustable Length of Pull: |
Yes |
Built in Cheek Rise: |
No |
Adjustable Cheek Rise: |
NA |
Reviews (48)
48 reviews
Write Review
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5 AwesOme, whEther fixed or folded
Diedrich on Dec 6th 2021
This skeletonized tube is a game changer for wanting an AR style collapsing stock on on an AK. Runs smoothly with 1913 folding mech on pistol Note: If you combine with skeletonized tube with the folding mech, have a slimmer brace/stock if you want to have a more flush fit. Another great product! Well done Justin, Ash, and JMac Team!
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5 Review for ST-6 5.5mm
Ben Walker on Nov 27th 2021
I have been searching for a stronger, more comfortable setup for my Tactical Edge Comrade AK and I finally found it in JMac’s ST-6!! The stock folder on the Comrade was terrible and in desperate need of an upgrade! The ST-6 allowed for a MUCH better platform to run an AR stock. The ST-6 is a SOLID setup and still folds up nicely next to the receiver. I am so happy JMac offers this setup! I’m a fan for life!
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5 The best
Zach on Nov 25th 2021
I don’t have a lot to compare it to because my only ever stock adapter I’ve used was also jmac customs but I like this one better than their buffer tube adapter, which is also badass. I was worried it would look weird but it looks super cool with the two stocks I’ve tried it on(Magpul ctr and b5 bravo). Both fit really snug on it. It feels solid also, even though it’s only really touching the bottom and top of the inside of the stock. The finish is as badass as it could get.
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5 St-6!
Joe on Nov 6th 2021
Tried many different stock options and this is by far the best. Feels quality and looks badass. This one is staying on for good!
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5 St6 on sam7sf
6urneravenue on Nov 5th 2021
Finish and fits was on point. Thanks. Worked great on my sam7s7.
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5 Great pro
Kyle on Nov 3rd 2021
Smooth edges , nice deep black finish and functional as it should be . Oh yeah , it looks cool too and that’s all that really matters!
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5 ST-6 5.5 for AK
Ron on Oct 21st 2021
Installed on KP9 in just a few minutes, perfect fit works great for AR stock or brace.
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5 ST-6 for my 7.62 Gen 2 Pistol
Shastian on Oct 13th 2021
Absolutely love this stock! My first time purchasing from JMAC and the quality is superb. I purchased the adapter with this, and it fit perfectly. It folds easier now and locks into place nicely. I thought it needed to be like an inch longer, but it actually feels really good in position 3 and 6. Overall great product. A++++
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5 SAM7SF Skeletonized tube
Kevin Ross on Oct 11th 2021
Been looking everywhere for an acceptable stock for this AK. Worst stock design from Arsenal I have ever seen, and the most limited to replace. Luckily I found JMac. Dude was great to respond on IM questions I had. Bought one instantly and it was at my door in three days. Never have been a fan of AR type stocks on an AK until now. Super easy to install and solid lock up. Threw a Magpul SLK on it and I’m set. Best decision I’ve made on an AK replacement stock. I might have to setup all future AK’s with this stock tube. Light weight but solid AF!!!!! Looking for a SAM7K-44 in the near future. This will be the stock I get for sure.
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5 Jmac Folding Mec ST-6
Reece D. Nors on Sep 2nd 2021
I got one of these guys for my BRN-180 Build and it couldn't be any more perfect. Not only does it look awesome, it's much more stable than some of the big name side folders out there. A buddy of mine also has a BRN-180 build with a certain name brand stock off of one of their snake guns and it would begin to fold in on itself if you put too much pressure on it while shooting. The JMac does no such thing, its easy to deploy and break down and there is no wobble. Super glad I went with this option and not with what so many other people are using. Besides being different, it's good to know i've got a stable platform on what is now my main shooter. Quality, application, and cool factor are all there, can't recommend enough.
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5 almost perfact.
Jake on Aug 20th 2021
This is a great adapter that allows you to retain the ability to fold your stock but also allows you to use an m4 style stock. it was very tight but with some minor sanding, I was able to get it to fit.
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4 Great Option for the PSA - 103, but some fitment may be required
Eric Wagstaff on Jul 19th 2021
Will this work on PSA-103, yes but some fitment maybe required. You may luck out based on your rifles tolerances but on mine the adapter wouldn't even fit onto the hinge, nor would PSA hinge pin fit. I'm not sure if PSA 4.5mm spec is smaller vs JMAC adapter is slightly larger, but I spent a few hours grinding and sanding the adapter to fit in the PSA hinge slot and then took a 11/64 drill bit to ream out the pin hole. After I got that all done, it fits and locks up beautifully. Now with a Magpul CTR stock it looks and feels great. If you want to replace the factory stock and don't mind some fitment work, if needed, this is a great option especially to not have a bulky M4 adapter/buffer tube setup.
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5 Must have for me
Timothy Yates on Jul 15th 2021
Finally an adapter that works on the SAM7SF. I can now use my favorite buttstock and get the proper cheek height, length of pull and more comfortable to shoot. I have installed the Fab Defense, MDT Minimalist and the SBA3 brace. All were somewhat loose but two strips of black electrical tape on top of the arm fixed that. For what it actually is, I think it's pricey. But hey, at least we/I have something I now enjoy shooting more than before. If you have any, some or all of the issues I have listed above then you need this. Spend the money and be happy. I did.
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5 4.5 mm stock ADAPTER
Sam on Jun 18th 2021
Fits my PSA ak-103 perfect. Great drop in piece of gear if you are looking to get rid of the 103 folding stock.
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5 St-6
Steven Perkins on May 31st 2021
Awesome product, mounted right up to my Sig MCX and fit a SB3 brace perfect!
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5 Great Stock
Clint Blumenberg on May 18th 2021
Lightweight, slick looking, and goes great on my MCX. It can be a little stiff to adjust positions, but I don't move my stock much anyway, so not a big deal. Great piece!
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5 St6 skeletonized buffer
Ryan watkins on Apr 24th 2021
Paired perfectly with my arsenal adapter. Beautiful fit and finish. Absolutely no complaints
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5 GREAT STOCK REPLACEMENT!
Steven on Apr 13th 2021
Bought this to replace the stock pistol brace with a Magpul stock after I SBR'd an MCX pistol but still wanted the foldability of OEM stocks. Unscrewed the pistol brace from the 1913 adapter and installed the ST-6. Magpul CTR fits perfectly and now I have the best of both worlds - foldable stock but with my own choice of buttstock!
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5 ST-6.
Christopher Nutter on Dec 29th 2020
Seems like a well made quality product. Fitment and finishing is superb. Looking forward to seeing how it looks on my Arsenal 104rf.
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5 ST-6
David on Nov 28th 2020
This was the perfect combo with the 1913 mech and a sba3 brace. Wow! It looks amazing and I have no complaints.
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5 ST-6 adapter
Todd on Sep 19th 2020
Ok, wow. This product exceded my expectations big time. I already had a Sig folder on my AMD with JMac adapter so i didnt order the ST-6 with one. Hey, do yourself a favor and order it with one. Trying to take out the Sig installed bolt was tuff. But once i got it on it is perfect! The Magpul M4 stock i used doesnt rattle on the ST-6 and lays almost flat against the receiver when folded. Top notch product
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5 Great option for AR stocks/braces
Michael on Aug 30th 2020
Picked this up to put on my Galil ACE. Paired it with the Sig folding mech. The JMac tube looks better on the rifle compared to an AR buffer tube. Excellent machining and fit. Stock fits perfectly on the tube.
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5 Amazing Brace mount
Nathan on Aug 26th 2020
I ordered this with the Sig folding mechanism for an MCX and used it with a SBA3 brace. This this is infinitely better option that the annoying spinning on the factory Sig brace. Solidly built, locks up amazingly, cannot recommend enough!