- Joined
- Dec 25, 2013
- Messages
- 1
- Reaction score
- 0
S&W M&P what size riser do i need for red dot
- Thread starter Rollincoal99
- Start date
Register to hide this ad
rojodiablo
Member
- Joined
- Sep 17, 2011
- Messages
- 1,759
- Reaction score
- 1,190
Use a tape measure to figure the difference in center heights. As to the riser, there must be a dozen companies making them. It's not a critical part, so buying one online cheap should be a non issue. Any number of shops will have them; Hamlund, DSG, PSA, Brownells, etc.
robkarrob
Member
It is going to vary on the site and mount you have. I have found anywhere between 1/2 inch to 3/4 inch works. It also depends on if you want to co-witness with the back up sights, and where you want the co-witness, centered or 1/3. I have always had to mount the site first, and then measure to determine where I wanted it located, then purchase the correct height riser.
I suggest using two small risers, as opposed to one long riser. This will save a few ounces of weight. On my 15T, I used two 1/2 inch high risers, that are each only 3/4 inch long. So I have 1 1/2 inch of riser length. Had I used a single riser, it would have been 5 inches long.
Everybody sells risers. Just search for picatinny riser. I get them mostly from amazon.
Bob
Photo of my 15T with Millet multi dot red dot, and 1/2 inch risers. I have just over a 1/3 co-witness with the Magpul flip up sights. You can also see the top of a Magpul BAD lever ($22 from Amazon). It allows a trigger finger bolt release or lock. I can easily release or engage the bolt lock using only my trigger finger.
I suggest using two small risers, as opposed to one long riser. This will save a few ounces of weight. On my 15T, I used two 1/2 inch high risers, that are each only 3/4 inch long. So I have 1 1/2 inch of riser length. Had I used a single riser, it would have been 5 inches long.
Everybody sells risers. Just search for picatinny riser. I get them mostly from amazon.
Bob
Photo of my 15T with Millet multi dot red dot, and 1/2 inch risers. I have just over a 1/3 co-witness with the Magpul flip up sights. You can also see the top of a Magpul BAD lever ($22 from Amazon). It allows a trigger finger bolt release or lock. I can easily release or engage the bolt lock using only my trigger finger.
Last edited:
cyphertext
US Veteran
Robkarrob, I have that same red dot mounted on my Sport. I'm using a cantilever mount from Primary Arms. It lets me mount the RDS more forward, but still on the receiver. Makes it much easier to shoot with both eyes open with the RDS. You might be interested in that set up.
robkarrob
Member
I always shoot with both eyes open. I find the further forward the scope is mounted, the smaller the field of view is through the scope. I keep my optics as far to the rear as possible, as long as there is proper and safe eye relief. Your set up looks to be 3-4 inches further forward than mine. Not a problem, but it does reduce some field of view. It also looks fairly high and would probalby not co-witness with my sights. I have fairly low Magpul flip up front and rear sights on my rifle, and the 1/2 inch riser allows for a perfect 1/3 co-witness, by just slightly lowering my eye line. If the riser was 3/4 inch or higher, it would not work with my back up sights, however the higher mount would make for a more comfortable head position, more straight up. I have an AR10 with a 1 inch riser plus another 1/2 inch V-riser, which holds a red dot on one side and a 3-9 power scope on the other side. Much more natural head shooting position. That rifle has a custom welded in BUIS in the center of the V-riser. No way to co-witness with that setup, as the BUIS do not align with the optics.
Bob
Bob
Last edited:
Guitarmageddon
Member
- Joined
- Oct 13, 2013
- Messages
- 231
- Reaction score
- 97
Mounting it more to the rear lets you acquire it a little faster. It is a larger field of view through the glass and you dont have to search so much for the dot. I also think that this whole "co-witnessing" mindset with red-dots is kind of a farce these days, and a product of the "tacti-cool bad advice" epidemic were in at the present. I have shot many types of optics in my profession and have had the opportunity to see that co-witnessing just makes the shooter question the instant sight picture you get with a red-dot, and thus, waste time
cyphertext
US Veteran
Sorry never got back to this...
OP, give Primary Arms a call. I would bet that the PA cantilever mount like I have would put your RDS in line with your magnifier.
As far as mounting the RDS forward or back, mounting forward does allow you to see more of your surroundings. Two schools of thought on it, mount it to the rear and shoot "through the tube", or mount it forward and have more "normal" viewing.
I use mine to hunt hogs and quickly finding the dot has not been an issue. As far as co-witnessing, I can use the irons through the tube, and they are lower 1/3 co-witnessed. My RDS and my irons are not zeroed the same either. But with my lower end optic, there is a higher chance of failure, so having both sights is important to me. If my RDS fails, I can take it off and use my irons to continue to hunt.
OP, give Primary Arms a call. I would bet that the PA cantilever mount like I have would put your RDS in line with your magnifier.
As far as mounting the RDS forward or back, mounting forward does allow you to see more of your surroundings. Two schools of thought on it, mount it to the rear and shoot "through the tube", or mount it forward and have more "normal" viewing.
I use mine to hunt hogs and quickly finding the dot has not been an issue. As far as co-witnessing, I can use the irons through the tube, and they are lower 1/3 co-witnessed. My RDS and my irons are not zeroed the same either. But with my lower end optic, there is a higher chance of failure, so having both sights is important to me. If my RDS fails, I can take it off and use my irons to continue to hunt.
Similar threads
