Excellent gas tube - V Seven Extreme Environment Gas Tube

Overall, this is an outstanding gas tube. The build quality and design improvements are apparent just by looking at the gas tube. The gas tube body is slightly thicker than a standard stainless steel gas tube. And the gas key collar is not just a widening at the bolt carrier end of the gas tube. It's a thickened lug that machine (or molded) into the gas tube.

Yes, this robust construction can cause fit issues with certain upper receivers and barrel nuts (notably, the SLR Rifleworks barrel nut). V Seven says this is not compatible with Aero Precision M4E1 upper receivers. But I had no fit issues using this gas tube in an M4E1 upper. Your mileage may vary.

In any case, as long as this gas tube fits, it's an impressively high quality part. And could be worth the rather high price if you're after a bombproof gas system. Though, most people don't NEED a gas tube this robust, since most people don't shoot full-auto or do high volumes of suppressed fire.

There's no penalty for having too much durability, in most cases, though.