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AT3 Rifle Lower Build Kit – Magpul Stock and Grip, AT3 Lower Parts Kit and Buffer Assembly
Lifetime WarrantyOn All AT3 Brand Products
All AT3 Tactical Brand Products carry a lifetime warranty against manufacturer’s defects.
This includes AT3 Red Dot Sights, Handguards, Iron Sights, and any other product that carries the “AT3 Tactical” or “AT3™” name. For other brands (ex. Magpul or Troy), please refer to the manufacturer’s warranty policy.
In the event that your AT3™ product becomes unusable, we will repair or replace the product at no charge to you.
If we cannot repair your product, we will replace it with a product in perfect working order of equal or better physical condition. The warranty is fully transferable, but we may require information about the original purchase to validate the authenticity of the product.
If your product is in need of warranty service, please contact AT3 Tactical to start the process
Our contact info is available here. To expedite processing, please provide your order information and description of the defect.
Please note: The AT3 Lifetime Warranty does not cover loss, theft, intentional damage or cosmetic damage that doesn’t affect the performance of the product.
Fast & Free Shipping On orders over $50
You will receive fast, free shipping for all orders over $50
Shipping cost is $7.99 for orders under $50. We ship with UPS or USPS, depending on the item.
Most orders received by 1pm CST ship the same day
You will receive an email with tracking information at the time of shipment. To expedite shipping, we may ship your order from multiple warehouses. Orders placed on weekends, holidays, or after 1pm will ship the following business day.
Finish Off Your New Rifle Lower with an Enhanced Trigger and Matching Magpul Furniture
Your AR lower has some of the most critical parts you don’t want to skimp on – but you don’t have to spend a fortune to get everything it needs. The AT3 Lower Build Kit has has all the trimmings at a discounted price, including Magpul furniture in a range of matching colors, and AT3’s Enhanced Trigger for a grit-free shooting experience the first time you take to the range.
About the AT3 Tactical Enhanced Lower Parts Kit with Magpul MOE Grip and Trigger Guard
This kit is great for any AR builder who wants quality components without breaking the bank, with the ergonomics of Magpul’s pistol grip combined with our Nickel Teflon Trigger Assembly. The trigger has a smooth pull and clean break unlike a stock milspec trigger, and the MOE trigger guard allows more room for comfortable shooting with gloves.
American Made Quality
- All parts meet or exceed military specifications (Mil Spec)
- Components are 100% Made in the USA
- Quality packaging keeps components protected and organized
- Backed by the AT3 Lifetime Warranty
About the AT3 Buffer Tube Kit
This Mil-Spec AR-15 Buffer Tube Kit includes the buffer tube, castle nut, lock plate, 3oz carbine recoil buffer and recoil spring. All parts are designed for easy assembly and compatibility with all your other AR-15 components.
Backed by the AT3 Lifetime Warranty.
- Buffer Tube Diameter: 1.146″ (Mil Spec)
- Buffer Tube Length: 7 1/4″
- Buffer Tube Thread type: 1 3/16-16 UN-3B SPECIAL
- Buffer Tube Material: 6061-T6 Aluminum
- Buffer Tube Finish: Black Anodized
- Spring Type: Carbine length, black coated
- Castle nut type: Steel with phosphate coating
- End plate type: Steel with phosphate coating
- Recoil spring type: Steel
- Buffer type: 3oz weight, carbine style
About the Magpul CTR Carbine Stock
The Magpul CTR (Compact/Type Restricted) – Mil-Spec Model is a drop-in replacement buttstock for AR15/M16 carbines using mil-spec sized receiver extension tubes. Designed for light, fast action the streamlined A-frame profile avoids snagging and shields the release latch to prevent accidental activation.
The CTR also features a supplemental friction lock system that minimizes excessive stock movement for enhanced weapon stability* and an ambidextrous QD sling mount that will accept any push-button sling swivel. The Mil-Spec Model includes a standard 0.30″ rubber butt-pad which provides positive shoulder purchase to prevent slippage even with body armor or modular gear.
Made in U.S.A.
- Mounts on mil-spec sized carbine receiver extension tube (not included) from manufacturers such as Colt, Armalite, S&W, LMT, and others (please see the note below)
- Supplemental friction lock minimizes accuracy robbing wobble*
- Sloping cheek weld combines a slim profile with user comfort
- Shielded release latch prevents snagging and accidental operation
- Premium chrome-silicon lock spring provides positive locking and long service life
- Side mounting slots accept optional cheek risers for NON-AR15/M16 applications
- Removable 0.30″ Rubber Butt-Pad offers an anti-slip surface and increases impact protection
- Compatible with Magpul ASAP® and other receiver-mount sling attachments
- Sling Mounts
- Rear – Push-button QD swivel sling mount accommodates up to 1.5″ swivels (ambidextrous)
- Rear/Bottom – 1.25″ sling loops
- Toe – Lanyard hole for custom para-cord rigs
- Optional Accessories**
- Extended Rubber Butt-Pad, 0.55″
- Enhanced Rubber Butt-Pad, 0.70″
- Cheek Risers (0.25″, 0.50″, 0.75″ for NON-AR15/M16 applications)
- CTR, Mil-Spec (stock configuration)
- Weight: 0.55 lb.
- Weight, w/ Rec. Extension: 0.80 lb.
- Length, Maximum: 6.90 in.
- LOP Adjustment Range: 3.25 in.
- LOP, M4 Collapsed: 10.70 in.
- LOP, M4 Extended: 13.95 in.
* Friction lock performance may vary depending on the host receiver extension’s dimensional tolerances.
Complete Lower Build Kit Includes:
- Magpul MOE Grip (With Grip Screw)
- Nickel Teflon Hammer
- Nickel Teflon Trigger
- Enhanced Disconnector
- Hammer Spring
- Trigger Spring
- Hammer Pin
- Trigger Pin
- Disconnector Spring
- Bolt catch
- Bolt catch plunger
- Bolt catch roll pin
- Bolt catch spring
- Buffer retainer
- Buffer retainer spring
- Magazine catch
- Magazine catch button
- Magazine catch spring
- Pivot pin
- Pivot pin detent
- Pivot pin detent spring
- Selector detent
- Selector detent spring
- Takedown pin
- Takedown pin detent
- Takedown pin detent spring
- Trigger guard roll pin
- Detailed parts diagram included for quick and easy part identification
- Magpul MOE Trigger Guard
- Mil-Spec Buffer Tube
- Castle Nut
- End Plate
- Buffer Spring
- Carbine Buffer
- Magpul CTR Carbine Stock