这个BCM的barrel如何？

pinetrees

计划再装一把AR，MA要求muzzle brake必须pin&weld，所以想搞个14.5“的枪管。老大们看看这个怎么样？
http://www.bravocompanyusa.com/B ... -mid-14lw%20std.htm

BCM  Standard  14.5" Mid Length (LIGHT WEIGHT) Barrel, Stripped
图片里barrel显示有 BFH。

THESE MEASURE .625" AT THE GAS BLOCK LOCATION Approximate Weight: 1lb 6oz. Professional Grade Weaponry® Made by Bravo Company MFG, Inc. (BCM®)These Barreled Upper Receiver Groups are designed for shooting professionals with the Mil-Spec features for the demands of their duty. These are stripped 14.5" Mid Length (LIGHT WEIGHT) Standard 11595E barrels with gas ports installed and dimpled for a strong gas block installation. THESE MEASURE .625" AT THE GAS BLOCK LOCATION M4 Feed Ramp Barrel Extension In developing the USGI M4 carbine as one of the primary weapons for today’s infantry, some modifications were performed to the original M16 platform to enhance the reliability of the shorter barreled carbines. With the shorter carbine gas system and the increased gas port pressure, the carbine cycled faster, and at times the cycle rate could be faster than the magazine would feed ammunition. One of the modifications done to increase reliable feeding included enhancing the angle and the length of the feed ramps. This USGI modification was done to both the barrel extension and the upper receiver, creating a longer and steeper feed ramp. These Mil-Spec M4 feed ramps are part of the original CNC manufacturing process. As a result, the factory machined M4 feed ramps on the receiver are hard coat anodized which adds significant strength to the aluminum. This feature is offered on all  BCM barrels. USGI 1/7 Twist Rate The USGI 1/7 twist rate of all of the BCM barrels is the preferred twist rate by most professional infantryman. This twist rate has proven very versatile and can effectively run the new heavier 5.56 ammo that is hugely popular with military and private security personal for its’ superior ballistics. Mil-Spec Barrel Steel (Mil-B-11595E) BCM barrel steel is Mil-Spec per MIL-B-11595E. This grade (CMV) of steel is a Mil-Spec steel used in the USGI M16 family of rifles; it is stronger and will last longer than the typical barrels offered in the commercial market. The Mil-Spec grade steel gets its’ additional strength and rigidity from an increase in carbon and/or vanadium in the alloy. This will offer increased barrel life and performance through use in all types of extreme environments and temperatures. Chrome Bore and Chamber One of the first modifications that were made to the original M16 in the mid 1960’s was the addition of the chrome lined bore and chamber. It is now a world wide standard in the industry for a battle rifle. The chrome bore and chamber is harder than the barrel steel and on the USGI M16/M4 rifles will aid in chambering, extraction, and reliability. It increases velocity, and also resist against fouling and corrosion from extended use in the field. This gives the end user a longer barrel life with less required time in maintenance and cleaning. Manganese Phosphate Barrel Finish Barrels are parkerized with the manganese phosphate finish (Mil-Spec A-A-59267). Military specifications also state that the entire barrel surface is phosphate finished to create a porous surface to absorb oil as to resist against corrosion from the elements. BCM barrels are phosphated before installation of front sights. This is a much more extensive assembly operation, but insures that the entire barrel is finished and protected . . .even under the front sight base. 5.56 NATO Chambers The USGI 5.56 NATO chamber is the best choice for effective deployment, reliability, and compatibility, of higher chamber pressures of military ammo. Government Barrel Profiles Duty rifles are built to be carried - day in and day out. The USGI barrel profiles (often referred to as the Government Profile) enable the operator to carry their weapon for longer periods of time and deploy them faster than the heavier commercial H-Barrel counterparts. The government profile barrel is also compatible with the current M203 mounting systems. HPT / MP Inspected Barrels Military specifications require that barrels undergo a HPT (High-Pressure Test) load as a part of quality assurance procedures. Commonly referred to as a proof load, the M197 HPT is rated for 70,000 psi. BCM barrels are proof loaded and then MPI (Magnetic Particle Inspected) to detect any possible flaws in the barrels surface. The barrels are MP inspected with both circular and longitudinal magnetic fields per ASTME1444-01 (current Mil-Spec) to assure a high quality finished product. All BCM barrels are marked HP MP as our proof load marking. Copyright © 2014 Bravo Company MFG, Inc.

                                           

	Features M4 Feed Ramp Barrel Extension (USGI) USGI 1/7 Twist Rates USGI 5.56 NATO Chambers Mil-Spec 11595E -  Barrel Steel (CMV) Chrome Lined Bore and Chamber Manganese Phosphate Barrel Finish USGI Government Profile Barrels HPT (High Pressure Test) Barrels MPI (Magnetic Particle Inspected) Barrels

Lancelott

依我的了解, standard 就不是 BFH

FJC

这个好

http://www.bravocompanyusa.com/B ... id-14.5-elw-bfh.htm

Al_Yu

DD :
https://www.westernsport.com/pro ... gov-profile-barrel/

X-PGH

我用过这个， A2 已经 Pin 好了 -

http://www.joeboboutfitters.com/ ... g-556-m-t-l-mfh.htm

The OD of the Manimal Flash Hider is SMALLER than the OD of the barrel to allow gas blocks to slide over

pinetrees

谢谢几位回答，我再想想 - 大佬们推荐的要double预算了

swthreefour

不是说又好又便宜的是AIM的FAXON吗？

oldben

Weekly Special & Updates - 12/12/2015!

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*OEM Customers - 5% Off

Coupon Code: FAXONSHOTCHRISTMAS

Our hottest barrels are running a ONE WEEK ONLY special through this week.

Perfect Christmas Gift for the discerning customer.

ARAK-31 Update 12/12/2015

We are finally into full production on most parts, but with the Christmas season and heavy demand on other products, ARAK-31's will likely start shipping just after SHOT Show.

There are still some minor bugs we are finishing kinks out of, but know chips are being made.

Full production ARAK-31 upper receivers will be at SHOT Show! Stop by our booth and see why the ARAK gets even better as it gets bigger. http://faxonfirearms.com/

pinetrees

oldben 发表于 2015-12-13 08:07
Weekly Special & Updates - 12/12/2015!

10% off All FLAME Barrels!*

谢谢，coupon只对flame管有效，flame没有14.5“的。