$41.95
5 in stock
Online inventory may differ from in-store availability.
Quick turnaround so you get your gear sooner.
Trusted checkout with industry-standard protection.
Keeping Traditions Alive Since 1953
Secure Transactions provided with 
When you're swapping out an A2 front sight or building a fresh upper around a slim handguard, the gas block you pick matters more than most folks give it credit for. This Midwest Industries Micro Gas Block is sized for .625 diameter barrels and keeps a genuinely low profile, so it disappears under most commercially available handguards and rails without any clearance headaches.
The body is machined from 4140 steel and wears a matte black finish that shrugs off wear and holds up to heat cycling. It measures 1.125 inches in overall length, weighs in around 1.2 ounces, and secures to the barrel with two set screws spaced .450 inches apart. That compact footprint is the whole point here. You get reliable gas metering without the bulk of an old-style front sight base eating up rail space.
This one is dimensioned specifically for .625 barrel gas seats, so double-check your barrel diameter before ordering since a .750 block won't tighten down correctly on a smaller seat. Builders consistently note that these slide on with a snug, clean fit and lock down tight once the set screws are seated. For the most secure hold, a barrel dimpled at the set screw locations plus a dab of thread locker goes a long way, and if you're not comfortable with the install, a gunsmith can knock it out quickly.
Midwest Industries has a long reputation for parts that hold up, and this micro block fits that mold. Longtime AR builders keep coming back to MI steel gas blocks because they're tough, they machine clean, and they stay put round after round. Whether you're running a lightweight carbine, a varmint setup, or a mid-length build, this little block earns its spot and it's backed by a lifetime warranty.
This block is machined for barrels with a .625 inch gas seat, so measure your barrel at the gas port area before ordering. A .750 barrel needs the .750 version instead, since the two are not interchangeable. If you're unsure, a caliper reading at the seat clears it up in seconds.
Yes, that's exactly what it's built for. At 1.290 inches tall and just over three quarters of an inch wide, the low profile design tucks under most commercially available handguards and free-float rails. Builders regularly run it under slim 15-inch M-LOK rails without clearance issues.
It locks down with two set screws spaced .450 inches apart. For the most secure, wobble-free hold, it helps to have your barrel dimpled at the set screw points and to use thread locker on the screws. That combination keeps everything put through plenty of rounds.
The block itself covers the gas port, but you'll supply your own gas tube separately if you don't already have one. The gas tube roll pin typically comes packaged with the gas tube rather than the block. It's a quick thing to confirm before you start your build so you have everything on the bench.
| UPC | 816537018209 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MI-MGB-625 |
| Style | Low Profile |
You must be logged in to post a review.
Reviews
There are no reviews yet.