SR22 and iron sights - Gas block rail height?

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alpining

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Hi all - While I wait for a SR22 to arrive, I'd like to prepare for (obsess over) sights... ;) I've decided to go with a gas block mounted front sight. I am guessing that I will need a combination of a tall gas block and a riser (maybe mix and match front and rear sights as well), but for now my question is about the total rise required.

If someone has done this before, advice would be great. Otherwise, if someone would be so kind as to measure the distance from the top of the barrel to the top of a full-length handguard rail (Dlask or other receiver-rail-height version), I would be most appreciative. :)

Thanks!
 
I just use a set of Magpul MBUS2 ... works. As long as you are getting/have a front top rail for the hand guard, you won't have to worry about much, only how much money you are going/willing to spend :D
 
Thanks for the response. To be clear: I am opting for a gas block mounted front sight, not handguard mounted. So my question is: What is the drop from the top of the receiver rail (or same-plane handguard rail) to the top of the barrel?

Thanks!
 
I have a Dlask rail mounted on my hand guard, which makes it on the same plane as the OEM scope rail that comes on the Nordic Kit that Ruger uses.

From the center bore to top of rail is 1 5/8"
From the top of the barrel to top of the rail is 1 3/16"

There is no gas block on the SR so any flip ups will do, or a front flip up or post matched with a carry handle site. If the rail is mounted flush to the top of the hand guard, then you would be shooting way to high if the front site is set that much lower than the rear sight.

Don't know if this helps you any, but it's the best I can explain it by your description.
 
Thanks JT, that's just what I needed. I'm adding an AR gas block so that the front sight is mounted on the barrel rather than the floating handguard. Should result in better accuracy.

Cheers, thanks again...
 
Not meaning to be a ####, but while mounting on the barrel might give you better accuracy for the front, you are forgetting that, if you are running a BUIS on the back, it is mounted on the aluminum cover/rail which is bolted onto the receiver and which has shook/expanded loose several times on me.

There is nothing wrong with what you are proposing, and will look cool and unique (nothing wrong with doing it strictly for that), but I don't know about improving accuracy.

I'm running a Dlask rail and some airsoft Troy knock-offs and they worked fine when everything was tight (but NOT overly tightened as you might strip the holes in the receiver).

Frankly, the best accuracy I got out of the rig (and stopped screws backing out) was when I took it over to a friend's place, he torqued all the screws and we mounted a scope with one ring on the receiver and one ahead on the Dlask forearm rail.

Yes, I know its not good for the scope to tie the two together like that but it is a cheap Tasco mildot I really don't care about, and it worked great to minimize any shifting of the shell. I was happily whacking gophers quite a bit farther out than I thought that SR22 was capable of last week and 750+ rounds later everything is still tight.
 
The OEM Ruger barrel that comes with the rifle is .750 in width if you plan on mounting a gas block on the barrel.
 
If your looking to run Irons and want a gasblock sight why not go with a mossberg tactical? Already has the sites you want and is half the price of a SR-22? If going with an SR-22 I'd just use the BUIS or some type of optic. Just my personal opinion. If you check out rimfire central and under tactical look at the Nordic thread there are several that have used the gasblock sight. Also the handguard on the SR-22 is not completely floating, there is a support block in the handguard supporting the barrel.

I went with a used EoTech on my SR and could not be happier.
 
Thanks for the advice everyone

@bullwhip: Not too concerned about the look of adding a gas block, just going for accuracy with irons. I understand that the 'receiver rail' is not permanently fixed to the actual 10/22 receiver inside the shell, and is thus technically floating as well. But it's gotta float less than that handguard. Regardless, my working theory is that mounting irons on two floating points is less accurate than mounting on one floating point and one fixed point. Interesting that your rig worked best with one ring each on the receiver and handguard rails. Did you leave the barrel support block in? I was planning to pull mine, due to reports of tighter groups with it removed.

@JT: Perfect, that's the same spec as the most common AR gas blocks.

@camaross: Not so interested in the Mossberg. I'm stoked on the performance of the 10/22 action, and I'm just looking for the best way to run irons as primary sights. Unless you know somewhere to get an EOTech for $200ish!:D
 
alpining said:
Thanks for the advice everyone


@camaross: Not so interested in the Mossberg. I'm stoked on the performance of the 10/22 action, and I'm just looking for the best way to run irons as primary sights. Unless you know somewhere to get an EOTech for $200ish!:D
Click to expand...

Yah I went with the SR-22 because I like the customization of the 10/22 you can do.

I picked up my Eotech on the EE for $330 shipped and I consider it money well spent, so fast to target.

The receiver rail is actually mounted to the 10/22 receiver, it screws into the normal scope mount holes. With a little dremeling where the mag goes in you can make it so you can remove the 10/22 receiver from the stock without removing this rail which is nice.

I removed the barrel support block from mine, but some people say not to because of barrel droop. I went with a 12.5" x .75 dlask barrel so I wasn't worried about this. I can get dime groupings at 25 yards which I think is real good for a non powered site.

2011-07-08gun002.jpg
 
Here's a pic of what I think you are going to do .. :D

100_2316.jpg


May not be the same, but this person mounted a gas block on the factory barrel.

Same persons rifle, different setup. Not sure of the make of barrel he used in these pics, but it looks very nice.

100_2781.jpg
 
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