I originally was going to use a Burris PRPR mount but these scopes are too long, because of the offset of the parallax and horizontal controls) to fit. I just zeroed them this past weekend and have the following observations:ġ.
I got two of these to try out (in 6-24x50) and have one on my 6.8 SPC and one on the 338 Federal. An alternative that you might want to consider are the new Monstrum FFP scopes. I also have several UTG scopes and like them for their ease of dealing with parallax and locking knobs, and they hold zero very well. Oh yeah, had to re-register since it kept asking me to reset my password. I'll use the lasers to measure angles and parallels, then get back to y'all. The experience with the Colt M4 has made me leery of assembly by factory. Still out there but at least its now the 6 ring at 11. I moved the sight to the HG and voila what a change. I used the Magpul Pro's but also have this mistrust of railed blocks.
I like the idea of the lasers to true things up. Yup, barrel loose and A2 sight tower cocked. At 25yds, shot cloverleaf, 100yds, cloverleaf, 200yds cloverleaf, 300yds all in the x ring. Disassembled, re-assembled, torqued according to specs, mechanically zero'd sights, used in the bore laser boresight, shifted sights elevation and windage by 2 clicks each left and up. New Colt M4 Carbine- yep have one of those, had the problem until I unscrewed the barrel which was loose at the time. Ordinary factory workers on an assembly line assemble them & DPMS doesn't make their own Barrels, so hard to say who makes them , DPMS Rifles, like most production rifles are built by factory line personal, like any factory, no longer are firearms made or assembled by GunSmiths.
The Upper Receivers can be Tweaked out of alignment by not using proper Fixtures to install the barrel or not having them set up properly. Īll this still doesn't mean you could have a goofy shooting Barrel, I've seen those also. on it & if that Gas Block is off to one side or the other, even a couple of hairs, you will have issues sighting the rifle. If the front Sight is low on that Gas Block Rail, you will have issues doing any adj. to center hit all ammo used in it, though its was still left in the rear Sight adj. That Laser I used was on a New Colt Carbine that was shooting so far right, the rear sight was buried to the left & still shot 8" right, by using the Laser, I found that the Taper Pinned A2 Front Sight Tower was off to one side, removing the Tapered Pins & aligning the Sight tower so it was dead on aligned with the Uppers Rail ( shown in the Photo ), the rear sight could be adj. If you had a Railed HG, did you try the Front sight on the HG's Rail ? I have never trusted Railed Gas Blocks to be precisely aligned with the Upper Receiver or that they are level with the Uppers Rail. If you are using Magpul Plastic/Polymer sights, they are not made to mount on a Railed Gas Block & they tell you so in the instructions, if they are the Pro's, not an issue. The use of the Laser will tell you if the Gas Block or sight is off, if the sights sight plane is dead nuts in line with the Uppers Rail ( measured aligning marks at the front & back of the Rail ) then that tells you it could be the Barrel thats off, be it mounting of Rifling or some other weird stuff. Don't know anyone close by really that has a DPMS Oracle in 308.
I have enough that I can do bore, sights in 2 ways and barrel alignment.
Survivalshop, that is a good idea on lasers. Wish I could post pics but camera won't be back from Nikon for a week. And I am curious- what difference do the various fft or detachable iron sights make if they are installed correctly? I'm looking for a way to inspect the method used to tap the receiver for the barrel as I suspect that as the culprit. You mount them, zero using a bore laser and the open bore (you know this trick- look down the bore from the breech at a black dot 25yds away with upper in a viseblock). Magpul front and rear sights are well Magpul front and rear sights. Put the Rock River CMP-legal FF tube that looks like the original A1/A2 handguards and it balances and holds right. Felt weird and seemed to put the COG too far forward. First 3 were from DPMS who installed them, Did not like them because they were basically unvented heat traps.
I have tried 5 different free float tubes. And for 98Z5V- have no idea who you are or what you do other than post. Used the original railed gas block for front sight mounting.