Yankee Hill Machine SLR .300 BLK | Gun Review

Unleash 300 Blackout firepower with this reliable slim, light, railed rifle!

Range Time
Match ammunition remains rare, not only in terms of build but availability. Remington’s 125-grain OTM match remains the 300 BLK standard, and it’s the only load I’ve tested so far that has accomplished true match accuracy. It has consistently provided the best groups in every 300 BLK rifle I’ve tested, and this test was no exception. The Remington 125-grain OTM ammunition produced a 0.75-inch group at 100 yards. Remington’s AccuTip round was almost as accurate. Everything grouped into 1.5 inches or less, making the YHM SLR plenty accurate for any duty environment.

Most of the range testing was completed using supersonic ammunition loaded by RTBA, an ammunition company in Texas. Loaded using Barnes’ excellent Tactical M/LE 110-grain bullet, this ammunition is well suited to duty use. It has also remained available during the shortages so common these days and has always been clean-shooting, accurate and reliable.

The SLR functioned flawlessly—there wasn’t a single malfunction—and its accuracy was excellent. The SLR forend kept the rifle pretty well balanced. Its thin profile and light weight are well suited to most grips, and the SLR is perfectly suited to the latest shooting methods. The rifle’s recoil was only a little more than a 5.56mm rifle, and muzzle rise was minimal. The flash suppressor looks cool and kept the noise to a minimum. The mil-spec trigger broke cleanly and predictably.

As a rule, mil-spec magazines will feed 300 BLK ammunition without issue. Some magazines have an issue locking the bolt to the rear. This seems to be more evident with shorter barrels, and it can be just as dependent on the build. With the SLR, all of my PMAGs worked, including several Gen 2 versions. I also tried some aluminum Brownells magazines and a few other quality, mil-spec brands—all worked fine. A consistent performer in this caliber is the Lancer Systems L5 Advanced Warfighter, and mine worked perfectly in this rifle. Everything ran in this rifle, suppressed or not.

Attaching the Phantom LT suppressor, accuracy at 25 yards and in was unchanged. When shooting a ton using a suppressor, you really need to keep the bolt carrier group well oiled, as you’re going to get a lot of buildup. After a couple hundred rounds, the rifle was filthy, but if I kept it wet, it still ran. Heat was noticeable after long strings, as expected, so if you shoot a lot like this, wear gloves. The SLR rail has lots of openings, so it dissipates heat well, but it will get warm. Backpressure with this can is what you would expect with a standard suppressor, but it did not adversely affect operation. Rapid fire did not seem to lock things up, and though a lot of excess gas came my way, it wasn’t much more than a 5.56mm similarly suppressed.

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