This video is a modification of the "new video format" I tested a few months ago.

Like the Centurion Arms C4 rail I recently reviewed, the Evo rail was provided by Rainier Arms. It is currently available for $175, which is, I think, a competitive price.

Nickel boron is a coating used by FailZero on bolt carrier groups and is purported to reduce lubrication requirements - eliminate them, actually, but I'll stop lubricating my weapons when the owners of FailZero plate the internal components of their cars' engines with nickel boron and stop using oil in them (I do realize that there are other considerations with engine oil- just go with me on this). Now, don't get me wrong - it definitely does have a "slick" feel, and the FCG is devoid of any grittiness whatsoever. I would just continue to lubricate any critical part that was plated with nickel boron, such as a bolt or bolt carrier.

The comparison shown herein is not meant to be scientific in nature, but does accurately depict my experiences with Nickel Boron BCGs.

Like a number of things reviewed here in the past, this rail was provided for review by Rainier Arms. The Centurion Arms C4 midlength cutout rail as seen here is available from Rainier Arms for $314. The standard midlength C4 rail is $246.

I'm not thrilled with the Enidine. Although it cycles slower, the difference comes from a slower return to battery, which I have not found to be conducive to higher reliability. This, coupled with the shorter stroke caused by the Enidine buffer, gives me reason for concern at this early point in my evaluation.

With the SAR rails, however, I did.

Spike's sent me two SAR rails, a 12" and a 9". They're very light - the 9" weighs under 10 ounces - and I like the titanium barrel nut that makes installation very easy. They have 4 QD sockets for sling swivels, and the width and height are pretty slim, meaning that it's easy to get a good grip on the rail.

My major issue with them is length. While the older BAR model rails left a short, perhaps 1/4" gap, between the end of the rail and an FSB at any standard length (carbine, midlength, or rifle), the SAR leaves a gap of over 1/2" - meaning that the gas tube is far too exposed. This 12" rail should not leave such a large gap with a rifle length gas system.

I'm using KAC rail covers to cover the gaps, and they seem to do a fine job of protecting the exposed area. Still, it would seem that the SAR rails are intended for use with low profile gas blocks only, in lengths that would cover the gas blocks, not with FSBs placed at the carbine, midlength, or rifle locations.

This is pretty brief, as I'm preparing for a rather exciting adventure at the moment, but here's an overview of some unknown Vltor history, as well as photos of some of their new products.

One of the oldest Vltor products actually originated under ASAR, or Abrams Small Arms Research, before Abrams Airborne acquired Vltor years ago. That product is the CASV, which received several modifications for functionality and durability before being sold under the Vltor name. What you see here on the left is an original CAS-V prototype - made of titanium! - next to one of the newest CASV models, the split-level CASV-ELS.

The titanium prototype is rather heavy, as well as being expensive to produce, so the current aluminum CASV is a much more useful product to most end users. Thousands are currently in use by various US Navy units, among others.

Here are the new split-level versions, the CASV-ELS for carbine length ARs and the CASV-S for midlength ARs. The bi-level version allows for cowitness of optics mounted on the forward portion of the handguard. I've been using a CASV-ELS for several months, and love the profile of the newer handguards - they're ideal for "thumb-forward" support hand shooting.

Vltor still manufactures standard level CASVs, such as this CASV-M, shown with the optional front sight.

From oldest in the background to newest in the foreground, here's a glamor shot of some AR CASVs.

Vltor also manufactures quite a few M1A components, including the stock and handguard shown here. I was surprised to find that this weapon didn't feel too heavy and balanced quite well. Please excuse the poor framing of this shot.

Other AR type stocks are compatible with the tube shown here.

One weapon that definitely hasn't escaped the touches of Vltor is the SCAR. Here's a SCAR-H with the full treatment - a CASV-type handguard (extended beyond the factory handguard length, and allowing for better heat dissipation) and an AR stock adapter that has a very nice height adjustment system - which, unfortunately, I did not photograph very well.

Vltor's HK416 handguard - the exact designation of which I am unsure - is one of my favorite products, though I'm not really sold on the 416. I found it intriguing that the HK416 emitted a low, pulsating hum and fluoresces under UV light - no, just kidding.

You will soon be able to buy an AR that's almost entirely Vltor, as they've started manufacturing AR-15 lower receiver assemblies (they'll be sold as you see here for $379 starting in a few weeks). The three stand-out features are an enhanced magwell, an enlarged magazine release button, and a receiver endplate with side QD sockets that are tucked in close to the receiver.

Hopefully, in a month or so, I'll be able to report on some other Vltor news.