LMT 308AR LOWER PARTS KIT 308lpk

LMT 308AR LOWER PARTS KIT AR-10

LMT 308AR LOWER PARTS KIT

LMT 308AR LOWER PARTS KIT 308lpk

LMT 308AR LOWER PARTS KIT with TWO STAGE TRIGGER 308LPK – LMT (LEWIS MACHINE TOOL) 308AR LOWER PARTS KIT 308lpk with Two Stage Trigger. Maybe the most expensive .308 lower parts kit to date. At the time of writing this we have zero hands on experience with this 308AR LOWER PARTS KIT.  Any feedback from users would be greatly appreciated. Thanks in advance.

Details

.308 Lower Parts Kit includes:

  • Takedown Detent.
  • Takedown Detent Spring.
  • Takedown Pin.
  • Fire Control Detent.
  • Buffer Retainer.
  • Semi-Auto Ambidextrous Selector Assembly.
  • Bolt Catch Spring.
  • Magazine Catch.
  • Magazine Catch Button.
  • Magazine Catch Spring.
  • Bolt Catch Plunger.
  • Bolt Catch Retaining Pin.
  • Bolt Catch.
  • Bolt Catch Roll Pin.
  • Receiver Pivot Pin.
  • Ambidextrous Mag Release.
  • Trigger Guard Roll Pin.
  • Trigger Guard Assembly.
  • 2 Stage Trigger/Hammer Assembly.

308AR BOLT CATCH SCREW BOLT CATCH PIN

Picture of a 308 AR Bolt Catch Screw Bolt Catch Pin

308 AR BOLT CATCH SCREW and BOLT CATCH PIN

Early on at 308ar.com we did a page that referenced the the point that the Armalite AR-10 utilized a BOLT CATCH ROLL PIN same as the Armalite M-15 (AR15) rifle while the DPMS LR-308 308 AR and similar rifles utilize a BOLT CATCH SCREW. Well despite that page we still get many questions about this small part. Based on these messages I decided a simple picture might be easier to understand in this day of sort attention spans. While I believe there are a small minority of 308 AR manufacturers using BOLT CATCH ROLL PINS just as there is an AR-15 manufacturer or two have adopted the BOLT CATCH SCREW feature. This post is meant to make folks aware of the differences.

 

308 AR BOLT CATCH SCREW SOURCES

  • DMPS LR-308 BOLT CATCH SCREW
  • AERO PRECISION BOLT CATCH SCREW – Aero Precision refers to this part as the M5 Threaded Roll Pin

    Our threaded roll pin is used in multiple applications, including for the bolt catch on our M5 Lower Receivers and for the forward assist on our Upper Receivers. Made from stainless steel, it has a 6-32 thread pitch and is designed to be installed with a 1/16″ Hex Key Wrench.

    Note: This product is already included with our M4E1/M5E1 Enhanced Uppers, M4E1 Threaded Uppers, M5 Upper Receiver and our M5 Lower Receiver. It is not necessary to be purchased separately. This individual product is available for customers who have lost or damaged their existing threaded roll pin.

    Works With:

    • M4E1 Enhanced Upper Receivers
    • M4E1 Threaded Upper Receivers
    • M5 Upper Receivers
    • M5E1 Upper Receivers
    • DOES NOT work with our M4E1 Lower Receiver
    • DOES NOT work with a standard AR15 Lower Receiver
  • FALKOR DEFENSE (SI DEFENSE) BOLT CATCH SCREW

At this point I cannot definitively state what 308 AR rifle manufacturers use the threaded BOLT CATCH SCREW or the BOLT CATCH ROLL PIN. Feel free to contact us and let us know whether your lower utilizes a BOLT CATCH SCREW or BOLT CATCH ROLL PIN


308 AR AR-10 Manufacturers who utilize a BOLT CATCH ROLL PIN

  • ARMALITE
  • SUN DEVIL

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Aero Precision 308AR Standard Lower Parts Kit APRH100160

Aero Precision 308AR Standard Lower Parts Kit APRH100160 www.308ar.com

Aero Precision 308AR Standard Lower Parts Kit

 

Aero Precision 308AR Standard Lower Parts Kit APRH100160 helps you to build a custom .308 AR from the ground up. Mil- spec dimensions and coating ensure the highest quality and correct component interface.

Aero Precision 308 Standard Lower Parts Kit APRH100160Features:

  • Aero Precision M5 (.308) Complete Lower Parts Kit
  • The custom takedown and pivot pins are made to work with our M5 lower. They will work with DPMS-pattern lowers as well but will stick out further.

Aero Precision 308 AR Standard Lower Parts Kit Includes:

  • Takedown/pivot Spring
  • Takedown/pivot detent
  • Trigger/hammer pin
  • M5 .308 Takedown pin
  • M5 .308 Pivot pin
  • M5 .308 Bolt Catch
  • Bolt Catch Spring
  • Bolt Catch Buffer
  • Bolt Catch Roll pin
  • Safety Selector
  • Safety Selector Spring
  • Safety Selector Detent
  • Buffer Retainer
  • Buffer Retainer Spring
  • A2 Pistol Grip
  • Pistol Grip Screw
  • Pistol Grip Lock Washer
  • Trigger Spring
  • Hammer Spring
  • Disconnector Spring
  • Magazine Catch Body
  • Magazine Catch Spring
  • Extended Magazine Catch Button
  • Hammer
  • Trigger
  • Disconnector

Aero Precision 308AR Standard Lower Parts Kit


FAR 308AR Lower Parts Kit Without Trigger

Fulton Armory FAR 308AR Lower Parts Kit Without Trigger

Fulton Armory FAR 308AR Lower Parts Kit Without Trigger

 

Fulton Armory – FAR 308AR Lower Parts Kit Without Trigger

Back in 2008 or so there were far less manufacturers of 308AR parts and with the most anti-gun President in history there was suddenly a shortage of parts. Items like RIFE BARRELS, BOLT CARRIER GROUPS and LOWER PARTS KIT‘s. Fulton Armory was like my personal secret stash of gun parts.

Compatibility – Fulton Armory FAR-308 and DPMS LR-308 Pattern Lower Receivers

Includes:

  •  Front Pivot Pin
  • Front Pivot Pin Detent
  • Front Pivot Pin Spring
  • Rear Takedown Pin
  • Rear Takedown Pin Detent
  • Rear Takedown Pin Spring
  • Magazine Catch
  • Magazine Catch Button
  • Magazine Catch Spring
  • Safety, Safety Detent
  • Safety Detent Spring
  • Buffer Retainer
  • Buffer Retainer Spring
  • Titan A2 Pistol Grip
  • Pistol Grip Screw
  • Pistol Grip Lock Washer
  • Titan Heavy Duty Bolt Catch
  • Bolt Catch Buffer
  • Bolt Catch Spring
  • Bolt Catch Screw.

FAR 308AR Lower Parts Kit Without Trigger


308 AR Bolt Catch Screw | AR-10 Bolt Catch Pin Comparison

Picture of a Falkor Defense 308 AR Bolt Catch Screw Bolt Catch Pin

308 AR Bolt Catch Screw or Threaded Roll Pin

308 AR AR-10 Bolt Catch Pin – The bolt catch pin, one of the smallest parts on the AR 308, AR-10 and AR-15 platform weapons is a part that can stop an AR-10 308AR build dead in it’s tracks if you didn’t purchase the correct one or the correct LOWER PARTS KIT for your STRIPPED LOWER RECEIVER. Here’s why. The AR-15 platform  uses a roll pin and that’s taken for granted when shooters move up to the AR-10 and 308 AR platforms. Unfortunately this is where the topic gets muddy.

Picture of Armalite AR-10B Lower Parts Kit 10LRPK-T

Armalite AR-10B Lower Parts Kit 10LRPK-T

Armalite AR-10 rifles use a traditional roll pin setup in the AR-10 lower receiver so their Lower Parts Kits obviously include the pin. If you use an AR-10 LPK on your non Armalite 308 AR you will need to order the threaded “Bolt Catch Screw” seen elsewhere on this page. I typically keep the Armalite LPK’s on hand as well as a few of the bolt catch screws.

Picture of an Armalite AR-10 and AR-15 EL0220 Bolt Catch Roll Pin

Armalite AR-10 and AR-15 EL0220 Bolt Catch Roll Pin

The Armalite AR-10 utilizes this roll pin, Armalite part number EL0220 which is the same as their M-15/AR15 rifles. Alternatively DPMS LR-308 based weapon utilize a proprietary hybrid pin/screw (mentioned above).

Picture of a DPMS AR 308 Bolt Catch Screw

DPMS AR 308 Bolt Catch Screw

The DPMS 308 Bolt Catch Screw is essentially set screw who’s threads have been removed from one end creating a hybrid screw type pin. Now unfortunately though not all DPMS LR-308 platform based LOWER RECEIVERS utilize the hybrid BOLT CATCH PIN. Some manufacturers utilize the roll pin method identical to the Armalite AR-10.

Picture of 308 AR, AR15 and  AR-10 Roll Pin Tools

308 AR, AR-15 and AR-10 Roll Pin Tools

The process of installing the Bolt Catch Pin is probably one of the most difficult tasks for the inexperienced to perform. Not done properly it’s easy to damage the finish of your lower or worse, break something. Fortunately a little grease, a roll of masking tape and some special roll pin punch make it easy.  Visit our AR-10, 308 AR Roll Pin Tools Page

Aero Precision M5 Extended Magazine Catch Button

Building an Aero Precision m5 308 AR semi auto rifle and the magazine catch button too short? That’s because you need the proprietary Aero Precision M5 Extended Magazine Catch Button, or an Aero Precision M5 Lower Parts Kit.  The Aero Precision lower parts kit  includes the extended magazine catch button.

Picture of an Aero Precision M5 Extended Magazine Catch Button | Aero Precision Extended Magazine Catch Button APRH308185

Aero Precision Extended Magazine Catch Button APRH308185

Aero Precision Extended Magazine Catch Button

So you have that brand new Aero Precision M5 308 AR lower or perhaps even another brand and you notice the magazine catch button is literally hanging by a thread or two after assembling. Aero has solved this with a $5 part (that Brownells should also offer). That part is Aero Precision Product Sku: APRH308185 Aero Precision M5 Extended Magazine Catch Button.

Aero Precision M5 Extended Magazine Catch Button -The Extended Magazine Catch Button is a drop in replacement for the standard lower receiver magazine catch button. This extended button is longer, allowing it to protrude the proper distance when used with our M5 Lower Receiver.

Aero Precision M5 Extended Magazine Catch Button solves the “magazine catch is too short” problem builders experience when assembling an Aero Precision M5/308 AR lower receiver.


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