AT3 AR-15 Lower Build Kit - Magpul Stock and Grip, AT3 Lower Parts Kit and Buffer Assembly
or 4 interest-free payments of $46.91 with 
6 Magazines Per Order: Due to extreme volume, we are limiting sales of magazines to 6 per customer order. This applies to individual and bundled magazines. AT3 reserves the right to cancel any order over the 6 magazine limit.
- Free standard shipping on orders $139+ details
- 90-day no-hassle returns policy
- Backed by 2 brand warranties what it covers
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Product description
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.
Specifications:
- 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.
Features
- 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)
Specifications
- 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
- 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
All 3 options on this page
- AT3 AR-15 Lower Build Kit - Magpul Stock and Grip, AT3 Lower Parts Kit and Buffer Assembly - Color: Black | SKU: AT3-LBK-RFL-01-BLK
- AT3 AR-15 Lower Build Kit - Magpul Stock and Grip, AT3 Lower Parts Kit and Buffer Assembly - Color: FDE | SKU: AT3-LBK-RFL-01-FDE
- AT3 AR-15 Lower Build Kit - Magpul Stock and Grip, AT3 Lower Parts Kit and Buffer Assembly - Color: OD Green | SKU: AT3-LBK-RFL-01-ODG
Customer reviews 5
Verified buyerAT3 Tactical · Hello there, thank you for taking the time to leave us a review for our AT3 AR-15 Lower Build Kit. We're glad to hear that you are satisfied with the Magpul stock and grip, as well as the AT3 Lower Parts Kit and Buffer Assembly. We strive to provide top quality products and we're happy to know that we met your expectations. Thank you for choosing AT3 and we hope to continue providing you with excellent products and service in the future. Have a great day!
AT3 Tactical · Thanks for sharing your feedback! We're glad you're satisfied with your purchase.
However I called and told them what I thought was missing and you guys sent it right away.
I would suggest just having a double ke check on parts before sending out.
This is my 1st build so I hope I got everything
Thanks
AT3 Tactical · Thanks for sharing your feedback! We're glad you're satisfied with your purchase.
AT3 Tactical · Thanks for sharing your feedback! We're glad you're satisfied with your purchase.
Questions & Answers
No questions yet. Ask about fit, install or compatibility and our team answers within a business day.
Warranty & returns
Backed by the AT3 Lifetime Warranty!
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.
Backed by Magpul Warranty!
Magpul Warranty Information
If you ever experience an issue with a Magpul product at any time, regardless of where it was purchased, please contact us directly and we’ll do everything reasonable to help you.
To make a return, please take the following steps:
- BEFORE returning any products, please contact us first to receive an RMA number (Return Merchandise Authorization) and prominently write it on the outside of the package. Packages will not be accepted without an RMA.
- Include a note with your name, shipping address, phone number and email, RMA number, and reason for the return (including, if applicable, information about the firearm, ammunition, and usage environment for defective returns). Do not send ammunition.
- Wrap the item with quality padding and place it in the original packaging or in an appropriate box for shipping.
- A UPS shipping label will be provided in your shipment. If using the original packaging, remove or cover the original shipping label. Tape the preprinted return shipping label to the outside of the box. Drop package at an official or authorized UPS drop-off location.
- All refunds will be applied to the credit card used for the original purchase. You should allow one to two billing cycles for the refund to appear on your statement.
Disclaimer: Manufacturer’s warranty is subject to change without prior notice.
90-day no-hassle returns
The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.
If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.
