Bobro scope mount peeking onto handguard

[jumbopanda]

I have a SWFA 1-6x24 scope in a Bobro extended mount, and have found that the only way I can get a comfortable amount of eye relief (if shooting nose to charging handle) is to let the front of the mount peek into the handguards a little bit. Is this an acceptable way of positioning the mount, or should I simply get into a habit of moving my head back a little?

[Failure2Stop]

Not optimal.

Without seeing your entire setup, it looks like you might have some room to push the optic forward in the mount.

What optic do you have? Looks like an SWFA, but I'd like to verify before basing advice off of it.

It appears that you would have to be shooting from a closer than NTCH position to not be able to have sufficient eye-relief on most optics that I know of.



Typos brought to you via Tapatalk and autocorrect.

[jumbopanda]

Not optimal.

Without seeing your entire setup, it looks like you might have some room to push the optic forward in the mount.

What optic do you have? Looks like an SWFA, but I'd like to verify before basing advice off of it.

It appears that you would have to be shooting from a closer than NTCH position to not be able to have sufficient eye-relief on most optics that I know of.



Typos brought to you via Tapatalk and autocorrect.

Yes it's a SWFA 1-6. It's already pushed all the way forward in the mount. The eye box on this thing is very far out. I can have the mount placed entirely on the upper receiver, but that requires me to adjust the way I'm used to positioning my head. It's not a terribly big deal I suppose.

[Failure2Stop]

It looked like an SWFA to me, but since you were saying that it wasn't giving you enough eye relief I thought that you might have something different.

The 1-4 and the 1-6 list identical eye relief (3.75").
I had a 1-4 for quite a while in a shorter Bobro mount and had no issues with eye-relief.
Same for a Bushy 1-6.5, Leupy Mk6 1-6, and Mk8 1.1-8.

Unsolicited advice:
Mount the optic in the mount as far forward as possible, with about a 1/8" gap between the erector housing or beginning of the ocular bell (whichever is closer, though it is usually the erector housing).

Move the optic back until the rear edge of the ocular bell is directly above the BUIS/edge of the end of the top rail over the CH.

Extend your stock. Unless you have very short arms and/or are shooting from a squared shoulder position, without armor on most shooters benefit from running the stock all the way out, or a notch or two in from full extension. If you are shooting from a rigidly square shoulder position, seriously consider why you are doing so. I'm not trying to make this an argument about your position, simply pointing out that all of the folks that do this for a living recommend a slightly bladed upper body position that allows the shooter to use the shoulder pocket while extending the support arm to control the front of the handguard without having the arm/hand pronated. Lots of good reasons for this, again, not trying to derail your thread, so I'll leave it to you on how you want to perform.

Check eye-relief from standing, kneeling, and prone, and extend/reduce eye relief as necessary by moving the mount forward and rearward. Generally, prone will cause you to crowd the optic more than standing, and prone is generally the position from which precise shots will be taken, so I like to ensure that the optic position is most supportive of that position/need. A fully extended stock will help keep things "in the box" as your positions change.

I know that this is completely un-requested information, but it's akin to a new driver complaining that they can't see over the dashboard while their seat is completely leaned to the rear. One might look more cool, or be more comfortable while not engaged in the task, but escaping that uninformed presupposition will help you perform the task at hand better.

[jumbopanda]

I would extend the stock if I didn't live in California. I used to use an A1 length fixed stock, but switched to a Magpul fixed carbine stock. The fixed carbine is great for shooting while standing squared to the target, but a bit short for other positions. Clearly, allowing a rifle to be too ergonomic would make it an "assault weapon."

I'll definitely consider what you said about shooting positions. Thanks for the input.

[Failure2Stop]

The fixed stock position certainly makes everything harder.
For clarity's sake (and I like to gather all the data I can), would you describe your standing upper body position to be:

Squared, like an isosceles pistol stance
-or-
Bladed, like a traditional bullseye rifle stance
-or-
Slightly Bladed, like a boxing stance

What is the relationship between your nose and your charging handle in the standing?
Touching
Almost touching
No idea

Where is your support hand on the handguard and arm position while in the standing position?
Fully locked-out arm, hand at the end of the handguard
Slightly bent arm, hand at the end of the handguard
Fully locked-out arm, hand not at the end of the handguard, but not at the midway point
Bent arm, hand grasping the middle position of the handguard or near the magazine well.

Where is the stock placed in a standing position?
On the ball of the shoulder
Inside the ball of the shoulder
Between the inside of the ball and the pectoral muscle
On the edge of the pectoral muscle, near the shoulder
On the pectoral muscle

What is your overall stock length (measured from rear of CH to the heel of the stock)?

[jumbopanda]

The fixed stock position certainly makes everything harder.
For clarity's sake (and I like to gather all the data I can), would you describe your standing upper body position to be:

Squared, like an isosceles pistol stance
-or-
Bladed, like a traditional bullseye rifle stance
-or-
Slightly Bladed, like a boxing stance

Squared. In this position, the eye relief is fine. It's when I go prone or bladed that I start having problems.

What is the relationship between your nose and your charging handle in the standing?
Touching
Almost touching
No idea

The tip of my nose is maybe 3/4" away from the CH.

Where is your support hand on the handguard and arm position while in the standing position?
Fully locked-out arm, hand at the end of the handguard
Slightly bent arm, hand at the end of the handguard
Fully locked-out arm, hand not at the end of the handguard, but not at the midway point
Bent arm, hand grasping the middle position of the handguard or near the magazine well.

Slightly bent arm, hand at the end of the handguard

Where is the stock placed in a standing position?
On the ball of the shoulder
Inside the ball of the shoulder
Between the inside of the ball and the pectoral muscle
On the edge of the pectoral muscle, near the shoulder
On the pectoral muscle

On the ball of the shoulder

What is your overall stock length (measured from rear of CH to the heel of the stock)?
9.25"

I ordered an extended buttpad to add 0.5" to that though.

I guess I'm more used to shooting with irons and red dots than scopes. I've only recently begun to appreciate them.

[Failure2Stop]

Yeah, the 9.25 stock length is an issue.
No way that is going to be fun from the prone.

You might be able to cheat an inch by moving the stock to the joint of the pec and pocket, but it isn't going to be much.

If I was in your position I would try to find a solution that would give me around 11" of stock length or accept that the bridging of the gap is going to make the optic pressure sensitive.

Typos brought to you via Tapatalk and autocorrect.

[jumbopanda]

Yeah, the 9.25 stock length is an issue.
No way that is going to be fun from the prone.

You might be able to cheat an inch by moving the stock to the joint of the pec and pocket, but it isn't going to be much.

If I was in your position I would try to find a solution that would give me around 11" of stock length or accept that the bridging of the gap is going to make the optic pressure sensitive.

Typos brought to you via Tapatalk and autocorrect.

Well like I said, I used to use an A1 stock but I felt that something shorter would be more comfortable. At 9.25", the Magpul fixed carbine stock is perhaps a bit too short, but I'm going to try the +0.5" buttpad and see how that goes. If things really don't work, then I can always switch back to an A1 length stock, although that would be annoying because I just installed a carbine buffer tube on this gun not too long ago.

I moved the mount back so that it is no longer touching the handguard. Since this is as far forward as it can go, I'm just going to leave it be and work on the stock length and my shooting technique. There aren't many other options I guess.

The other scope that I own is a Nightforce NXS Compact 1-4x, and I've never had an eye box issue with that one, even when I bring my face really close to it. I haven't measured, but I think the SWFA requires my eye to be roughly an inch farther back than the Nightforce does.

Thanks for the help, your posts have been informative.