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Selecting a Handguard for your AR-10/AR-308/LR-308?
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The family of rifles generally referred to as “AR-10″s or “AR-308″s encompasses a variety of rifles from a variety of manufacturers. Although similar in appearance and function, different rifles may have different upper receiver designs with parts that may or may not be interchangeable. This situation makes shopping for a free float quad rail or handguard a bit complicated.
AR-10 style rifles have a few different commonly used barrel nut designs (the attachment point for a free float handguard), each of which is compatible only with a free float quad rail or handguard built specifically for that design. The two most common standards are for the original AR-10 and for the DPMS LR-308. Both of these standards are now used by a number of different manufacturers.
Armalite AR-10 Style Handguards
The original AR-10 was developed in the 1950’s by ArmaLite, who still owns the AR-10 trademark and sells the only rifle officially called the AR-10. ArmaLite AR-10 rifles use their own proprietary barrel nut standard which is incompatible with most AR-10/308 derivative rifle models on the market. The thread specifications for the AR-10 barrel nut are 1-7/16” and 18 TPI-3A. Besides ArmaLite, some popular rifle models that have licensed and use this barrel nut design include the Eagle Arms AR-10 the Noveske N6. Handguards compatible with these rifles are offered by LaRue, PRI, Badger Ordinance and Daniel Defense among others.
DPMS LR-308 Style Handguards
Rifle maker DPMS would go on to develop their own AR-10 style rifle called the LR-308, with the same general design but with a number of parts incompatible across platforms including the barrel nut/handguard. The barrel nut standard based on the popular DPMS LR-308 has become the most widely adopted on the market. The thread specifications for the LR-308 barrel nut are 1-7/16” and 16 TPI-
2A. Numerous manufacturers make rifles using the LR-308 barrel nut standard including the Remington R25 and the Bushmaster 308 ORC.
*Please note that while the barrel nut standard for the DPMS LR-308 rifles has remained the same, there are two different versions of DPMS upper receiver that differ in the height of the receiver rail. Upper receivers manufactured before August 2009 have a high profile receiver rail, while upper receivers manufactured after August 2009 have a low profile receiver rail. Handguards made for the low profile receiver will still fit the older receiver, but the top rail will not align squarely with the receiver top rail.
We carrie Made in USA low profile DPMS LR-308 pattern free float Keymod and Mlok rails in a variety of lengths at the lowest prices anywhere starting at just $49.95.
DPMS GII Handguards
To confuse matters further, in 2014 DPMS released the DPMS GII 308 rifle. The DPMS GII is likewise, a DPMS made .308 rifle with an AR style design. However, the GII uses its own proprietary barrel nut standard. GII barrel nuts are not interchangeable with LR-308 barrel nuts.
Other Non-Standard/Proprietary Handguards
Besides these standards, several other manufacturers of AR-10 style rifles use their own non-standard or proprietary style of barrel nut including Ruger SR-762 and the Daniel Defense DD5 V1.
AR-10/AR-308/LR-308 Free Float Rail/Handguard Compatibility List
To confirm what type of handguard will fit on your AR-10/308 rifle please refer to our AR-10/308 hand guard compatibility list below. The list is not comprehensive. If you have any additions or updates, please let us know. Before purchasing a handguard, we highly recommending confirming compatibility with your rifle manufacturer.
LR-308 Pattern |
AR-10 Pattern |
Non-Standard |
DPMS Oracle .308
DPMS .308 Classic
DPMS LR-308L
DPMS TAC20
DPMS Long Range Lite
DPMS NATO REPR
DPMS Lite Hunter
DPMS Recon
DPMS Sportical
DPMS Compact Hunter
DPMS LR-308B
DPMS LRT-SASS
DPMS AP4
DPMS MK12
DPMS 3G1
DPMS LR-308T
Smith & Wesson M&P 10 Series
Bushmaster .308 ORC (low profile)
Remington R25 (low profile)
Palmetto State Arms PSA PA10
Palmetto State Arms PSA PAC Tac10
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ArmaLite AR-10 Rifles
Noveske N6
Eagle Arms AR-10
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Aero Precision M5 (High Profile)
DPMS GII
Ruger SR-762 308 rifle
Rock River Arms LAR-8
LaRue Tactical OBR 7.62
LaRue Tactical PredatOBR 7.62 and
LaRue Tactical PredatAR 7.62
Daniel Defense DD5 V1
Sig Sauer 716 Patrol
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Ade Advanced Optics first made its appearance in the firearms accessory industry by doing private label production for several major manufacturers and retailers. During this period, Ade Advanced Optics began receiving requests from numerous customers for access to the affordable, high quality products that Ade Advanced Optics was capable of producing. By soliciting feedback from both clients and end users, Ade Advanced Optics was able to overcome the challenges a new company often faces when entering a global market and industry, especially one as competitive as the shooting, hunting, and outdoors industry.
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Are you a dealer, shop owner, armorer, weekend show vendor or have a dozen buddies that might want to do a group buy? We are here to help you!
On many items, we can offer bulk wholesale pricing. We are the manufacture of many items, the direct importer for many more and can save on shipping and handling on everything by shipping in bulk. And….We are more than willing to pass the saving along to you!
On any of our items you see that you might like to buy in bulk, send us a message with what you would like and how many. We will make a special listing for you with the bulk pricing and send you the link. Just be aware that after they go ‘live’ someone else could jump on it, so let me know if there is a time you would like it up. Often these prices will be way too low to advertise! You will need at least ten of each item to be shipped at a time, and the more you want, the lower the price can be.
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Purchase Eligibility |
We have to accept the fact that things are different than when we were younger, so please make sure you can legally order and possess this item BEFORE you submit your bid. All NFA rules apply, where applicable. YOU are responsible to following ALL laws and regulations regarding the ownership, possession and end use of this item. If there are any restrictions on your legal ability to own and use a firearm or ammunition, you will also not be able to purchase this product.
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