Wondering if anyone has mounted a ZCO 4-20 on a split rail Long action and gotten proper eye relief. I have a L/A Impact NBK coming in a month or so and looking to mount my ZCO on it or start looking for another optic if need be. Has Anyone done this and gotten proper eye relief?… if so what is your LOP? Searched this pretty extensively with not much success.
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Rifle Scopes ZCO 4-20 on long action
- Thread starter IronOperator87
- Start date
I tried my 4-20 on a full length pic rail on a hunting setup and couldn’t get it to work on a 13.5” LOP stock. I would’ve needed an adjustable comb, and preferably an adjustable height butt pad.
So I’m guessing the objective bell was hitting the front of the rail and higher rings ( along with adjustable comb) would have solved the problem? Thanks
I had one on a full length integrated rail with a EH1 and it was fine. The rings were roughly in the same spot they would have been on a split rail. I had it in both the Zeiss (tier one?) rings and then later in Hawkins 1.0 heavy tactical’s.
Maybe I just like weird eye relief, but I didn’t have any issues.
Maybe I just like weird eye relief, but I didn’t have any issues.
After talking with Richard@cst and the other replies here it seems like if I run my normal for me height rings (1.2x -1.3x) it should work. I was mainly worried about the short length of rail in the front of the action and the short tube between the bell and the erector of the scope not giving me enough room to move the scope back…. Or maybe I’m just looking for an excuse to buy another scope 
Either way thanks for everyone’s input and I’ll just have to wait and see for sure.
Either way thanks for everyone’s input and I’ll just have to wait and see for sure.Have zco420 mounted on custom howa long action with ARC rings. Have had to slightly mill the front of the rail to make it fit me perfectly.
Not sure of lop or the ring height but can go back through records if you want.
Not sure of lop or the ring height but can go back through records if you want.
Did you have any issues with the 420 on the long action NBK? I have an nbk currently on order and was thinking of putting a zco420 on it. I wanted to go with low rings just not sure how the fit would be. Maybe thinking of going with arc rings.
When I first mounted the scope all the way back ( without the front ring overhanging into the ejection port so one pic slot forward) with medium rings and a 13” LOP i wasn’t perfectly in my comfort zone. Over time I just got used to it and ran it but it wasn’t ideal for me. If I Would have been willing to move the front ring one pic slot back it would have been better and probably a non issue.
So even though it did fit sounds like overall you were not happy with the fit. I don’t want to be in the same boat. Maybe the 527 will work better.
I did this on a 787 split rail with Hawkins heavy’s and had it hanging 1/16” off towards the ejection port. Called Hawkins and they said the clamping force on the rail was fine and not to worry about rail capture or optics shifts. Held zero for the 250ish rounds of 7prc I shot before I sold the rifle. Couldn’t ever quite get over the aesthetics of it though, just looked wrong. It was sitting in a TS customs stock so similar lop to a EH1.
Im also getting the TS customs rifle in 7 prc. Any reason for selling? I’m thinking of going with the 5-27 to avoid some of those issues but its not that much bigger than the 420.
Mine was a 787 and proof prefit, only the stock was from TS. I sold because I wanted to go a completely different route with a build and ended up with a 15lb 300prc
if you haven’t purchased the optic yet, I’d strongly consider the 527 to avoid the fitment issues with the long action.Lol I’m in the same boat trying to decide how heavy I really want to go with a 7prc hunting rifle. Rifle on its own will be a little under 8lbs. Nx8 would be lighter and put me right at about 10 lbs with rings which is a good weight I think. Zco is a better scope but rifle will probably be closer to 11lbs.Mine was a 787 and proof prefit, only the stock was from TS. I sold because I wanted to go a completely different route with a build and ended up with a 15lb 300prc
The difference between 10 and 11 pounds will be negligible, if I were you I’d opt for the better light transmission glass and run it heavier. Now if the difference was 10 and 13lbs then you start noticing the weight. Also depends on your comfort distance hunting. If it’s 600 and in, for example, I’d think about the 4-16 atacr. Locking turrets, super compact design, ffp, can take a beating, etc.
I have the 420 and 527. The 420 is probably my favorite scope all around, but it's not well suited on a L/A hunting rifle IME - specifically if you don't have an adjustable comb.
Like you said the 527 gives you a little more length, but not a ton. PERSONALLY, I would take a Kahles 525 DLR for a hunting specific rifle as it will mount a little better IME, and you can save about 1/2 pound. I prefer the 527 to the k525 overall, but for a dedicated hunting rifle, the 527 is not ideal.
A Tangent Theta "M" series is even more gooder in my experience.
I also have a 4-16 ATACR referenced above, and it's a good scope as well. But if you have ZCO/Tangent money, get a ZCO or Tangent over the ATACR.
Yeah the weight difference is not that much overall but it is sounding like for a long action hunting build the 420 or 527 are not ideal.
That is why I am looking at the 420 as I keep hearing it is just a great overall scope, sounds like it is not the right scope for my application though. The 527 gives a bit more length but It is heavier and like you mention still won't be the best fit for the application I am using it for mostly hunting although it will be used for paper and steel as well. I have heard good things about the TT315M as well. Less weight, top glass. Not sure on the reticle for hunting though I've read the gen2xr can be too fine in lower power, maybe the mil dot?
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Mil dot for sure - at least for where and how I hunt. It’s a great hunting reticle. I’d prefer 0.2 mil hashes, but it’s still useable with it’s 0.5 mil hashes. It’s easily visible down to 3x.
This is why trying to save a few oz on an action with a split rail is always a dumb idea. Severely limited mounting options. Not to mention you get a more rigid action with an integral full rail.
The NBK is a fools errand, same as that new removable rail action. Take the best action on the market and then start removing features that make it what it is.....
Tate would be better if reintroducing the titanium action.
The NBK is a fools errand, same as that new removable rail action. Take the best action on the market and then start removing features that make it what it is.....
Tate would be better if reintroducing the titanium action.
I’m going to have to agree with you on the split rail especially on a magnum where setup is crucial and a little extra weight helps.
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