Eurodriver
03-03-19, 17:36
https://i.imgur.com/uEFjMs9.jpg
Top Rifle A: Quality, smaller company 11.5” Carbine upper (name omitted for a reason. Everyone here has heard of them)
Bottom Rifle B: LMT Complete 10.5” SBR
Both uppers were bought new and were not disassembled since leaving the factory. Both uppers have fixed front sight bases. Both have carbine length gas systems.
I have about 7,500 rounds through Rifle A with an Aimpoint T1, and only about 1,000 through the LMT. (Random fact: I’ve had the LMT about 3x longer.)
Both rifles shoot excellently and I’ve never had a single issue with either.
Yesterday I moved the T1 from Rifle A and put it on Rifle B, and then put a new T2 on Rifle A.
Holding them side by side trying to get a makeshift zero by adjusting the dot to the irons I immediately noticed that when cowitnessing Rifle A the FSB was way off in the bottom right corner but the LMT was right where you’d expect it to be.
These were the best pics I could manage to get. You can easily tell Rifle A from B because B has the blue tint from the T1.
Edit: So this didn’t show as well as I’d hoped but you can definitely see Rifle A’s FSB angled off to the right.
https://i.imgur.com/VkYth5q.jpg
https://i.imgur.com/M2m85Nh.jpg
My immediate thought was - oh no. I didn’t go with Larue for an optic mount on the T2 and I am being punished by Sky Daddy for making such a junior analyst decision.
But then I switched optics and the T1 was showing the same issue. This eliminated the optic and mount as the source of the issue. (The above was a joke, I own many ADM mounts and trust them.) Furthermore, I’d shot that combination for years and years and never noticed the FSB was canted nor had I ever had issues with irons so while it was a problem I just noticed last night, it wasn’t something that was a functional problem and more importantly I knew that by my own shooting experience.
I still wanted to find the issue though so I then switched rear sights on the rifles. No difference. This leaves the FSB on Rifle A as the only untested variable.
The odd thing was that both rifles had zeroed irons and neither had any significant windage adjustments on the rear sight. I told myself “You’re being one of those over analytical internet guys who is too interested in finger ****ing a rifle on the couch and not spending time shooting it”
So after putting Rifles A&B back together last night, I dragged my ass to the range this morning and the optics on both rifles were zeroed at 100m per Mr. Leuba, USMC (SFMF), a confirm zero was done on the irons (neither of which required any adjustment), and then I moved to 200y where I proceeded to smack gongs for the remainder of the morning with boring regularity.
To recap: I’ve got 7,500 rounds (now almost 8,000) put through Rifle A. It has always shot well. No significant windage adjustments with irons to achieve zero. Today it shot well both with irons and the T2. (I went 10/10 on a 10x12” gong at 200y using the irons cowitnessed with the dot off and without adjusting the irons at all - and that’s after removing and reinstalling it the night before as mentioned above)
In practice, this isn’t an issue and I should be enjoying this Maker’s Mark as I sit here outside enjoying this lovely breeze. But why is the FSB off? Is it canted on the barrel? Is it just tolerance stacking? Is it common? Is it common with the “big” brands? I can’t say I’ve ever noticed it before because I’ve never cowitnessed two rifles side by side.
I’m also curious why Florida trees dump their leaves in March while up north it’s in October. How you gonna dump leaves and sprout new growth and pollen at the same exact time. Stupid Florida trees.
I’m sorry if this thread is hard to follow.
Top Rifle A: Quality, smaller company 11.5” Carbine upper (name omitted for a reason. Everyone here has heard of them)
Bottom Rifle B: LMT Complete 10.5” SBR
Both uppers were bought new and were not disassembled since leaving the factory. Both uppers have fixed front sight bases. Both have carbine length gas systems.
I have about 7,500 rounds through Rifle A with an Aimpoint T1, and only about 1,000 through the LMT. (Random fact: I’ve had the LMT about 3x longer.)
Both rifles shoot excellently and I’ve never had a single issue with either.
Yesterday I moved the T1 from Rifle A and put it on Rifle B, and then put a new T2 on Rifle A.
Holding them side by side trying to get a makeshift zero by adjusting the dot to the irons I immediately noticed that when cowitnessing Rifle A the FSB was way off in the bottom right corner but the LMT was right where you’d expect it to be.
These were the best pics I could manage to get. You can easily tell Rifle A from B because B has the blue tint from the T1.
Edit: So this didn’t show as well as I’d hoped but you can definitely see Rifle A’s FSB angled off to the right.
https://i.imgur.com/VkYth5q.jpg
https://i.imgur.com/M2m85Nh.jpg
My immediate thought was - oh no. I didn’t go with Larue for an optic mount on the T2 and I am being punished by Sky Daddy for making such a junior analyst decision.
But then I switched optics and the T1 was showing the same issue. This eliminated the optic and mount as the source of the issue. (The above was a joke, I own many ADM mounts and trust them.) Furthermore, I’d shot that combination for years and years and never noticed the FSB was canted nor had I ever had issues with irons so while it was a problem I just noticed last night, it wasn’t something that was a functional problem and more importantly I knew that by my own shooting experience.
I still wanted to find the issue though so I then switched rear sights on the rifles. No difference. This leaves the FSB on Rifle A as the only untested variable.
The odd thing was that both rifles had zeroed irons and neither had any significant windage adjustments on the rear sight. I told myself “You’re being one of those over analytical internet guys who is too interested in finger ****ing a rifle on the couch and not spending time shooting it”
So after putting Rifles A&B back together last night, I dragged my ass to the range this morning and the optics on both rifles were zeroed at 100m per Mr. Leuba, USMC (SFMF), a confirm zero was done on the irons (neither of which required any adjustment), and then I moved to 200y where I proceeded to smack gongs for the remainder of the morning with boring regularity.
To recap: I’ve got 7,500 rounds (now almost 8,000) put through Rifle A. It has always shot well. No significant windage adjustments with irons to achieve zero. Today it shot well both with irons and the T2. (I went 10/10 on a 10x12” gong at 200y using the irons cowitnessed with the dot off and without adjusting the irons at all - and that’s after removing and reinstalling it the night before as mentioned above)
In practice, this isn’t an issue and I should be enjoying this Maker’s Mark as I sit here outside enjoying this lovely breeze. But why is the FSB off? Is it canted on the barrel? Is it just tolerance stacking? Is it common? Is it common with the “big” brands? I can’t say I’ve ever noticed it before because I’ve never cowitnessed two rifles side by side.
I’m also curious why Florida trees dump their leaves in March while up north it’s in October. How you gonna dump leaves and sprout new growth and pollen at the same exact time. Stupid Florida trees.
I’m sorry if this thread is hard to follow.