I know the Lyman 5A precision adjustable mounts have a good reputation.  How about the Lyman 422 mounts?  I know nothing about these but they look similar to a 5A.  Are they a later version of the 5A?  How about quality?  Any comments appreciated.  Thanks

Wayne

Texasmac, I don't have my Stroeble scope book here at the moment, but IIRC, the 422 is indeed meant for .22s, as indicated by the last two digits of its name... it was a 4X scope intended for .22 rf rifles.  Further, I believe you will find the micrometer adjust knobs and the mount ring over-all are scaled down a bit compared to the 5-A.  I'm speculating here, but I think it would have been a little more delicate than the 5-A, which wasn't all that robust in the first place.  I stress that this is JMHO, and I still haven't had my first cup of coffee this morning.

Froggie

In trying to figure out what approach I’m going to take in “scoping” a Browning BPCR, I’ve got two threads running on this forum.  One approach is to purchase a complete scope and mount system from MVA or Parsons.  Another is to purchase a stand-alone ¾” scope from one of 5 suppliers (RHO, Parsons, MVA, Leatherwood, Romano) and use Lyman’s 5A or Winchester’s A5 mounts.  I discussed this some time ago with an experienced BPCR scope shooter and gunsmith, which I respect.  He suggested the Lyman 5A as the best solution with the Winchester A5 as a 2nd choice.  He said that the MVA mounts are good but have potential lash/hysterias.  In this regard the Lyman or Winchester are better and start to fall into the category of precision instruments.  He further commented that the Unertl mounts are the best of all, but not NRA legal.

He referred to Winchester A5 mount as the “grasshopper” mount in reference to the under tube spring.  He indicated that both the Lyman and Winchester, if they were the clicked version, could be easily de-clicked to make them NRA legal.  Due to his request I’m not mentioning his name because he has been asked to do product evaluations, including scopes and mounts.

Wayne

The Unertl mounts are legal if you take the clicker out.  I got  this from
the NRA Silhouette Committee.  You can drop them an email if you wish.
There were six shooters last year at Raton at the Nationals shooting
the Unertl mounts.
There is a thread on BPCR I started a while back and ended up with a email form the NRA Committee.
Bob

While you are talking to the NRA  (get it in writing!) see if they will let you use the Unertl POSA type mount.  The difference is that the mount frame is split on the bottom and it actually clamps the block when you tighten the thumb screw.  There is also a a half moon shaped cutout on the block and and a shoulder on the thumb screw which fits in there.  Steve Earle can make the bases either way.  The POSA mounts were developed when people started putting Unertl scopes on high power rifles and the stress on the traditional little scallop cut / screw arrangement became a problem.  The Redfield Big Bore screws and bases are much the same thing.  From a reliability standpoint the POSA mounts would be safer: less likely to come flying off the rifle.  I would also Locktite the base screws.  

Does anybody have the required specs for the scope tube itself?  I know it has to be 3/4" in diameter, and there is little or no bell allowed at ocular or objective end, but is there a length requirement?  Do the little 422 length or the 5A length body tubes pass muster?  Inquiring minds...

Froggie

The NRA rule book states the scope tube body to be 3/4" or less in diameter and any ocular or objective lenses, adjusting or assembly rings to be less than 1" in diameter.
No length or power limitations.
This is for NRA BPCR Scope Class