Before we begin with reducing the weight of a battle rifle, we need to define it. A Battle Rifle can be basically defined as a semi-automatic rifle chambered in a cartridge of .308 Winchester or bigger.
Battle Rifle Selection
I personally prefer either an SR-25, M110 or other AR type battle rifle that uses Magpul .308 PMAGs or an HK-91/PTR-91 type rifle simply because of the parts and magazine availability in the United States.
There is still a niche for the PTR-91 and HK-91 rifles simply because the platform is not really ammo sensitive and the magazines are reliable and inexpensive.
HK-91, G3, or PTR-91 Rifles
- Decide on what the rifle’s mission or job requirements are.
- What distance are you likely to use it at?
- Under what circumstances may you need to deploy the gun?
- About short barrel lengths on a .308
- If you need something for very short range use, remember that the PDW barrel length significantly reduce the velocity and terminal performance of a .308 bullet.
- Do you need to mount any forward grips on the hand guard?
- Do you need to mount any flashlights on the hand guard?
- Here are the weights (measured in ounces) for the available hand guards and stocks for the PTR-91
- From http://www.hkpro.com/forum/hk-long-gun-talk/106129-weight-hk91-g3-forearms-2.html
Butt Stocks (all w/backplate & recoil rod/spring and standard buffer – where applicable):
46.5 – SR9 thumbhole (Rare)
33.9 – HK new retractable convex (Sliding Stock)
33.2 – Choate folder (I’ve had a good experience with this stock)
26.4 – Tapco T6 4-pos – US (I checked Tapco’s site and this one doesn’t seem to be available anymore)
25.6 – ACE folder – US (ACE may have a somewhat extended waiting time)
25.4 – HK light-green A2
24.8 – FMP green A2
24.2 – Wood stock
22.9 – PTR black A2 stock – US
just the backplate w/rod and spring is around 8.5
just the standard buffer is about 4.1
just the MSG90 buffer is 6.5Handguards:
13.8 – HK wide new
13.1 – HK wide old
12.5 – Wide black vented
12.3 – SR9
10.7 – PTR Aluminum – US (Most common on PTR-91 rifles)
7.1 – HK slim w/heat shield (Easily found on www.hkparts.net)
5.9 – HK wood
4.5 – PTR slim w/o heat shield – US
SR-25/AR-10 Pattern Rifles
There are primarily two magazines styles for the .308 rifles, the original Armalite-Fairchild magazines used in the original AR-10s, then picked up by the KAC SR-25 (henceforth called the SR-25 Type) and the Modern Armalite AR-10 type which is a modified M-14 magazine. It should be pointed out RRA (and formerly Bushmaster) make rifles that use FAL magazines, and CMMG has a lower which uses G3 magazines.
- Armalite AR-10 type (used by Armalite, Noveske, Eagle Arms, Georgia Precision; capacities: 5, 10, 20, 25)
- SR-25 Type
(used by DPMS, KAC, LaRue, POF, LWRC, JP Rifles, 1950s Armalites, Remington, Fulton-Armory; capacities: 4, 10, 19, 20)
- FAL Magzines (Metric or Inch pattern; used by Bushmaster, RRA; capacities: 5, 10, 20, 30)
- G3 Magazines (CMMG .308 Lower)
- One thing to also remember about .308 ARs is that there is not yet a specification that they all generally adhere to.
- Be sure to do your research first on lower receiver to upper receiver compatibility.
- There is a lot of great information here http://www.ar15.com/forums/t_3_121/413443_.html
- Configure separate upper receivers for long distance use and CQB use.
- Long distance use uppers are going to be heavier because of the longer barrel that may also be a bull barrel.
- Short distance use uppers should be as lightweight as possible.
- CMMG announcing Mk3 CBR .308 carbine (guns.com)
- What Makes A Bad AR? Let’s Look At Battle Rifle Company (thefirearmblog.com)
- Battle Rifle Breakdown (fromthetrenchesworldreport.com)
- Gun Review: Ruger SR-762 (thetruthaboutguns.com)
- CMMG Mk3 CBR (Carbine Battle Rifle) (thefirearmblog.com)
- DADDY LIKE: Israel’s IWI Tavor Battle Rifle (directorblue.blogspot.com)
- Today’s Armalite AR-10 Battle Rifle – Gun Review (fromthetrenchesworldreport.com)
- CMMG’s New .308 Mk3 CBR (gunmartblog.com)
- The SAWs that never WAS: Part 4, H&K XM262 (weaponsman.com)
- Tell me again… (theboysgirl.wordpress.com)