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SKELETON ST-6 Folding Stock Tube RIS Mount - 5KU

49.90

Tax included Product made to order generally delivered in 7/10 working days.

The Skeleton ST-6 Folding Stock Tube from 5KU is a high-end CNC aluminum adapter. Designed for replicas equipped with a rear Picatinny rail (such as MCX, MPX, AK rail), it allows the installation of any standard M4 stock.

JC Style Design: Ultra-lightweight and modern skeletonized structure.
Folding Mechanism: Steel hinge with solid lock for transport.
Compatibility: Attaches to M1913 Picatinny vertical rails.
Materials: Anodized 6 Series Aluminum and QPQ Steel.

Size Guide

This is an approximate conversion table to help you find your size. If you have already purchased an item from our brand, we recommend you select the same size indicated on its label.

Men's Sizes

International	XS	S	M	L	XL	XXL	XXXL
Europe	32	34	36	38	40	42	44
US	0	2	4	6	8	10	12
Chest Circumference (inches)	33-35"	36-38"	39-41"	42-44"	45-47"	48-50"	51-53"
Chest Circumference (cm)	84-89	91-97	98-104	107-112	114-119	122-127	129-134
Waist Circumference (inches)	28"	30"	32"	34"	36"	38"	40"
Waist circumference (cm)	71	76	81	86	91.5	96.5	101.5

LOWA FOOTWEAR SIZE CHART

SIZE SELECTION:

THE SIZES IN THE DROP-DOWN MENU ARE UK SIZES (ENGLISH)

conversion chart: UK size - (IT size) - size in mm

Size 6.5 (40) 257mm

Size 7 (40 3/4) 262mm

Size 7.5 (41.5) 266mm

Size 8 (42) 270mm

Size 8.5 (42.5) 274mm

Size 9 (43 1/4) 278mm

Size 9.5 (44) 283mm

Size 10 (44.5) 287mm

Size 10.5 (45) 291mm

Size 11 (46) 295mm

Size 11.5 (46.5) 300mm

Size 12 (47) 304mm

Size 12.5 (48) 308mm

Size 13 (48.5) 312mm

NEED ADVICE ON CHOOSING A SIZE?

Take one of your sneakers and look at the size in mm or cm, look at the diagram above to see what it corresponds to and order your size!

e.g., your sneaker is 27.2 cm long? Great, the closest and most correct size will be: "TG 8.5 (42.5) 274mm", in the purchase menu select size 8.5UK!

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Description
Product Details

The ST-6 Skeleton Folding Stock Tube manufactured by 5KU (code 5KU-350) is the ultimate solution for those who want to install M4-type telescopic stocks on "stockless" or modern platforms equipped with a rear rail interface.

Skeletonized and Lightweight Design
Inspired by the famous "JC Style" (JMAC) design, this tube features a structure made entirely of CNC 6 Series Aluminum. The skeletonized milling not only drastically reduces weight but also gives the replica an aggressive and modern look. The matte anodized finish ensures resistance to scratches and wear.

Steel Folding Hinge
The critical point of any folding stock is the hinge. 5KU has made the locking mechanism and hinge in Steel with QPQ treatment (a process that increases hardness and corrosion resistance). This ensures that the stock has no wobble both in the open and closed position, offering the stability needed for precision shooting.

Total Versatility
This accessory clamps onto any rear Picatinny M1913 vertical rail (typical of SIG MCX, MPX, or adapters for AK and G3). Once mounted, the tube acts as a standard support for the insertion of any M4 retractable stock (such as Magpul CTR, MOE, Crane, etc.), allowing infinite customization.

Technical Specifications: