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I used this on a 20 inch rifle with a FN government barrel.
I did took it apart fully to put this on but you don’t have to. The Dremel method is the official way and does work fine. I just don’t actually own a dremel so I did it the long way.
Be sure to use a torque screw driver (25 FT/LBS) and the included vibritight. After you have it aligned to your satisfaction of course.
It’s quite light for what it is. Compared to a free float mlok rail of the same length. It’s Only a few ounces more in weight.
The QD points are great for slings too. I’ve got a mid length one order for a second rifle. Waiting on a QD bipod mount to complete it.
Ok let’s get started here. Do not buy this upper or any other from spikes. I’ve learned my lesson.
The barrel is either torqued to well over 100 foot pounds or they didn’t use any anti seize.
The gas tube is misaligned so the bolt gas key is striking it. So that’s how I found this all out. I figured I could quickly fix the alignment but nope. It’s hard seized. I broke my ar wrench on it.
I’m praying that spikes will fix it but the insane negligence on display here doesn’t make me hopeful. I would consider this upper a danger to life and limb at this point. The only thing not ruined on it is that the barrel isn’t clocked somehow.
I could build a better upper than this. Plus I’ve had better luck with Psa of all things.
A good set of night sights. Easy to install but the rear aperture is installed backwards compared to a normal sight. Something to keep in mind, the large peep sight is the first one on this.