MDT Castle Nut (100222-BLK) — replacement castle nut for carbine-length and fixed-stock AR-pattern buffer tube assemblies on MDT chassis systems and AR15 rifles.
$23.95
6 in stock (can be backordered)
The MDT Castle Nut (part 100222-BLK) is the locking nut that secures an AR-pattern buffer tube and end plate to the rear of an MDT chassis or an AR15 lower. MDT lists it as suitable for both carbine-length and fixed-stock buffer tube assemblies, so it pairs with the MDT carbine buffer tube (100567-BLK) and A1/A2 rifle tube on ESS, LSS, TAC21 and other MDT chassis that use an AR buffer tube interface. Fit it with a standard castle nut / armourer’s wrench and stake or thread-lock it once the stock is set.
Which buffer tubes does the MDT castle nut fit?
MDT lists it for both carbine-length and fixed-stock buffer tube assemblies with the standard AR castle nut thread.
Do I need an end plate as well?
Yes — the castle nut clamps the end (locking) plate against the receiver or chassis; the plate is sold separately.
Is a licence needed?
No — it is an unrestricted hardware part.
Specifications from MDT (mdttac.com).
Firearm parts and accessories are supplied by 3 Gun Tactical, Licensed Firearms Dealer 50001578, Tingalpa QLD. No licence is needed to buy chassis accessories, rails or hardware, but check your state’s firearm-parts rules before ordering.
The MDT Castle Nut (part 100222-BLK) is the locking nut that secures an AR-pattern buffer tube and end plate to the rear of an MDT chassis or an AR15 lower. MDT lists it as suitable for both carbine-length and fixed-stock buffer tube assemblies, so it pairs with the MDT carbine buffer tube (100567-BLK) and A1/A2 rifle tube on ESS, LSS, TAC21 and other MDT chassis that use an AR buffer tube interface. Fit it with a standard castle nut / armourer’s wrench and stake or thread-lock it once the stock is set.
Which buffer tubes does the MDT castle nut fit?
MDT lists it for both carbine-length and fixed-stock buffer tube assemblies with the standard AR castle nut thread.
Do I need an end plate as well?
Yes — the castle nut clamps the end (locking) plate against the receiver or chassis; the plate is sold separately.
Is a licence needed?
No — it is an unrestricted hardware part.
Specifications from MDT (mdttac.com).
Firearm parts and accessories are supplied by 3 Gun Tactical, Licensed Firearms Dealer 50001578, Tingalpa QLD. No licence is needed to buy chassis accessories, rails or hardware, but check your state’s firearm-parts rules before ordering.
| Brand | MDT |
|---|---|
| Model | Castle Nut |
| MDT part number | 100222-BLK |
| Fits | Carbine-length and fixed-stock AR buffer tube assemblies |
| Colour | Black |
| Availability | In stock at 3GT |
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