Single screw fixing barrels to frame

[Stone02]

My Pulsar has 6 screws connecting barrel shroud to barrel with an adaptor which is further attached to the barrel via a rail and 2 more screws. I've found that, over the years, this combination is rock solid. No zero wandering despite weeks between sessions and all sorts of storage positions.

So, I'm perplexed, if this level of engineering was required for the Pulsar, how come many of the latest rifles have only a single screw?

 

[nervoustrig]

A single grub screw holding a barrel is most definitely inadequate unless the barrel tenon is a perfect slip fit to the receiver...and perhaps even then.

 

[Stone02]

Maybe the design is focussed on the target shooter for whom sighters are no problem.

 

[ChRiSiS]

Well, notwithstanding all the stuff I see written about it, my two Impacts (a MK II and a M3), as well as my current Wildcat MK III BT (and the two other Wildcats I have had) were all perfectly fine with one grub screw holding the barrel in place. Admittedly these are all Bullpups, so there is additional support for the barrel, but I don't have the wandering zero that I often read about, not on any of my rifles. In addition, they are fantastically accurate anywhere from 15 to 100 yards (the Impacts anyway, I haven't taken the Wildcats out beyond the 50 yards that i have at home).

 

[Airgunmann]

I'm guessing it was built that way for ease of changing calibers there are several places where u can add grub screws if needed I tension my barrel on my impact and haven't had a problem with the single grub screw but have thought about adding one extra to it 

 

[elh0102]

As Nervoustrigger stated, the actual fit of the barrel shank in the receiver is critical. If the fit is precise, and the depth is adequate, then one screw works. An example, the Weihrauch HW100. If the fit is sloppy, then multiple screws may hold it securely for the moment, but you may have consistency problems in the long run. 

 

[Maineiac]

Maybe the design is focussed on the target shooter for whom sighters are no problem.

It’s focused on the ability to change calibers. The FX Impact may not have been the first, but they certainly popularized it.

I’d prefer a more robust setup myself, but if it works it works. Results speak for themselves.

 

[Dairyboy]

I'll be honest I too am not a fan of this. I actually prefer a barrel threaded into to receiver like AAA, Edguns, Taipans. However my RTI is held by one set screw to the receiver and I haven't had a single issue at all. I can't stand a gun that has POI changes. However the barrel fitment is snug, and slides in a shroud that slides through the frame and it's threaded to the receiver and then 6 set screws hold that shroud in place. Incredibly sturdy design. So it can be done correctly. But personally think it's not ideal.

 

[Glem.Chally]

Seems to work fine for the delta/alpha wolf, haven't seen any complaints regarding it.