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So, I just received my Quentin Laser 308 80% lower, and I happen to have a Tactical Machining one, as well. There are some difference between the two, as you can see in the pictures below.
1. The hole for the rear takedown pin's detente on the Tactical Machining lower is on the back, on Quentin Laser - on the bottom. This makes the hole on the Quentin Laser lower the regular length, the one on the Tactical Machining lower is longer. TM provides a pin to make up for the difference in length.
2. The QL lower has an extra threaded hole next to the one for the pistol grip screw. It has an allen screw in it. I've no idea what it's for, so if you know it, please, let me know. EDIT: looks like is a tension screw for the upper receiver.
3. The sides, the front, and the trigger guard are machined differently. Personally, I like the look of the TM lowers better, but to each his own.
4. TM lowers are forged, QL are billet.
5. One of the holes for the pivot pin is recessed on the QL lower.
6. Both PMAGs and GI mags drop free in both lowers. Keep in mind that the TM one has already been Type III anodized (after finishing it to 100%). While the QL one is still in the white, there's enough of a gap in the magwell that I doubt there'll be any issues with mags dropping free after anodizing.
Overall, it's pretty hard to pick one over the other. I personally prefer the TM ones, but solely based on the looks and the fact that they're forged.
I'm also curious how the QL lower will come out after anodizing. The QL AR-15 lower came out purplish.
And now, for the pictures:
1. The hole for the rear takedown pin's detente on the Tactical Machining lower is on the back, on Quentin Laser - on the bottom. This makes the hole on the Quentin Laser lower the regular length, the one on the Tactical Machining lower is longer. TM provides a pin to make up for the difference in length.
2. The QL lower has an extra threaded hole next to the one for the pistol grip screw. It has an allen screw in it. I've no idea what it's for, so if you know it, please, let me know. EDIT: looks like is a tension screw for the upper receiver.
3. The sides, the front, and the trigger guard are machined differently. Personally, I like the look of the TM lowers better, but to each his own.
4. TM lowers are forged, QL are billet.
5. One of the holes for the pivot pin is recessed on the QL lower.
6. Both PMAGs and GI mags drop free in both lowers. Keep in mind that the TM one has already been Type III anodized (after finishing it to 100%). While the QL one is still in the white, there's enough of a gap in the magwell that I doubt there'll be any issues with mags dropping free after anodizing.
Overall, it's pretty hard to pick one over the other. I personally prefer the TM ones, but solely based on the looks and the fact that they're forged.
I'm also curious how the QL lower will come out after anodizing. The QL AR-15 lower came out purplish.
And now, for the pictures:
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