FYI, the Promag is cheaper and based off the best scope mount design for this platform.
The CASM series scope mount, designed in 2010, solves a lot of problems that currently affect Brookfield Precision Tool inspired scope mount designs. For accurate, unbiased information in this regard, please review the Dec. 17th 2011 revision of
Lee Emerson's M14 Scope Mount FAQ, in particular, page 1 where Bill Ricca describes the scope mount fitment problems of the BPT scope mounts on
www.m14tfl.com.
I would also like to submit the following notes for your review when considering the M14.ca CASM series scope mount as we have addressed all of the following known problems with BPT-inspired designs:
1. no more scope mount-induced cartridge case jams
2. no concerns regarding out of spec. side mount bolt hole locations
3. no more worrying about shimming to set the proper tension and windage for horizontal zero on out of specification receivers
4. no concerns with stripper clip guide dove tail slots that may be out of spec.
5. never having to replace/cut ejector springs on your M14 bolt due to jamming issues
6. never having to pay a gunsmith to shim or setup your scope mount for grossly out of spec. receivers
7. never having to tack weld the side bolt as the Marine Corps Security Force, Pac were doing with their BPT inspired mounts
The CASM also brings innovations to the platform, namely:
1. Ease of installation. The CASM scope mount installation process requires no gunsmithing and sets up in 10 minutes
2. The CASM scope mount is the
only elevation adjustable scope mount for the M1A/M14 family of rifles (adjustable prior to installation only) which ensures you will never run out of adjustments at long range (we've had excellent reviews of shooters taking her out to 1000 yards).
3. The CASM offers the only double-locked design, whereby all four 1/4" fasteners have their own set screw and, it is "triple locked" with the supplied Loctite
4. The CASM affords the rifleman a scope mount that sets up further back in the rear sight pocket so even short eye relief scopes like ACOGs, have no problems
5. The CASM scope mount is one of, if not the lightest M14/M1A scope mounts available: it weighs approx. 150 grams (and adds even less gross weight overall as we subtract the weight of the M14 rear iron sight assembly).
6. The CASM offers a suitable, built-in and virtually unbreakable BUIS system intended primarily for back up or emergency use, with access to iron sights with the optic mounted, with iron sights that are zeroed for practical use at practical distances, within, we'd say 250 yards.
7. The CASM affords one of the longest, 6.25" picatinny rails that can also fit for example, an EOTECH XPS series red dot AND a side flip magnifier.
8. The CASM affords an extra 6.25" rail extension that suits owners of the SAGE EBR (or Blackfeather "RS") as the CASM sits higher than the SAGE EBR picatinny railed handguard fore rail, allowing for ability to align optics with forward mounted night vision equipment (our new, CASM "EX" rail will be 9.25" long, coming late February 2013 but will not be compatible with the SAGE EBR).
9. The CASM affords the end user a scope mounting position that offers better balance overall as the scope is setup further back into the rearmost tipping point of the rifle. Therefore, not only is weight minimized, balance is improved.
10. With the CASM scope mount, we offer a new, "unitized" scope mount to receiver design that holds zero. It's that simple. It's passed 1000 round field testing with no shift and to date is installed on rifles across Canada. When setup according to our instructions, the CASM scope mount will hold zero and will offer the rifleman a lifetime of use.
I would also submit our
Engineering and Design Considerations of the CASM Scope Mount written by an ex-Canadian military officer and former gunsmith.
Other than the considerations present in this document, I do not think I can add any more to my post regarding the advantages of the CASM scope mount design. Thank-you for your support. Any questions regarding the CASM scope mount can be brought directly to my attention. -Frank