- Location
- Parksville Vancouver Island
Enhance...
At least they have now redesinged it in steel and as long as you have a strong scope or better yet a red dot it should just work fine for those people shooting less than 2 boxes at a time.
M14 .ca Aluminum Mount vs Steel Mount ?
- Thread starter blueflash
- Start date
Enhance...
At least they have now redesinged it in steel and as long as you have a strong scope or better yet a red dot it should just work fine for those people shooting less than 2 boxes at a time.
Mauser GDog
CGN frequent flyer
I think your square is out of spec. 
Seriously though, if you have that much sag in your mount I wonder if you overcranked the front screw? Not sure if it would bend it like that but you better check.
And since you are doing your best to bash a fellow Canuck's / CGN'ers product, it would be nice if you took a decent picture that was in focus and showed the entire mount in view.
For all we know there is a dime jammed under the square out of frame...
For the record I had a CASM GEN I, tried it but didn't like the height of it.
Seriously though, if you have that much sag in your mount I wonder if you overcranked the front screw? Not sure if it would bend it like that but you better check.
And since you are doing your best to bash a fellow Canuck's / CGN'ers product, it would be nice if you took a decent picture that was in focus and showed the entire mount in view.
For all we know there is a dime jammed under the square out of frame...
For the record I had a CASM GEN I, tried it but didn't like the height of it.
Enhance...
At least they have now redesinged it in steel and as long as you have a strong scope or better yet a red dot it should just work fine for those people shooting less than 2 boxes at a time.
I see no broken sight ears?
- Location
- Burlington On
I'm pretty sure the CASM mount in aluminum would be fine as it's in line with the bore and solidly anchored. I think it's a great design but too high for a conventional stock.
I have a 305 with a UTG rail. It has barrel bands and butts up against the receiver. It doesn't move, been there for about 1000 rounds. You do have to wonder what happens when the barrel starts to whip around when fired though. Love to see some high speed film on it.
I have a 305 with a UTG rail. It has barrel bands and butts up against the receiver. It doesn't move, been there for about 1000 rounds. You do have to wonder what happens when the barrel starts to whip around when fired though. Love to see some high speed film on it.
This isn't how you install the CASM scope mount. You've over-torqued the large 1/4"x20tpi vertical fastener at the front. I will add if you do not follow the instruction guidelines for any scope mount, not just the CASM as shown, you will damage either your mount or your receiver, quite naturally. For example, Sadlak, which manufactures an excellent Brookfield-inspired scope mount offers the following notation during their installation procedure:
1) Hex Screw(3): 65-70 inch-lbs,
2) Two set screws in the Clip Guide Key(4): 30-40 inch-lbs
Warning: Use caution when tightening setscrews.
DO NOT OVER-TIGHTEN. Receiver may crack if
excessive force is used.
3) Clip Guide Screw(5): 30-40 inch lbs
Call me today noting that I am on Pacific Standard Time and we will work out the fix over the telephone. I can also send you an extra set of screws if you don't already have a set. Thank-you.
LordEvilPepper
CGN Ultra frequent flyer
- Location
- Under a rusty barge in BC
1)The CASM scope mount is made out of 7075 series aluminum. It has an ultimate tensile strength of 74,000–78,000 psi (510–572 MPa) and yield strength of at least 63,000–69,000 psi (434–503 MPa). Let's just say that is pretty damn good.
2)Dropping your rifle off a building is not going to help you in a SHTF situation.
3)I don't think that the design principle behind the CASM scope mount is being conveyed here properly. Let me explain. The 4-point retention system begins with the back of this mount tensioned up with an over-sized 5/16" half dog tipped set screw, which rotates the mount around the two tapered head 1/4" self centering screws in the rear sight ears. This upwards tension at the rear forces the front of the mount tight to the front of the receiver. By design, the mount is installed with the front end a few degrees down from true to the bore horizontal. Then, the front of the mount is pre-tensioned up a tiny bit by another 5/16" half dog tipped set screw. For greater security, both of the 5/16" vertical adjusting/ tension screws and the tapered ¼” side screws are locked immovably in place by smaller locking set screws. With blue Loctite, this “belt and suspenders” approach to keeping all the screws effectively double-locked, and in securing proper retention of any settings, is designed to achieve excellent security. This “pre-stressed for vertical adjustment” design, with the front and back of the mount held tightly against rotation, eliminates all variations in elevation due to mount shifting under recoil. The sides of the mount are held securely in horizontal alignment with the bore by tight fit in the rear sight pocket, and two large 1/4" self-centering screws through the holes in the rear sight “ears”. These side screws are locked in place by smaller locking set screws. The large amount of high-strength 7075 alloy material in perfect contact with the left side of the rear sight pocket, plus the tight clearances between the mount and the inside of the receiver rear sight pocket, plus the thickness of the material purposely left in the mount, holds the mount securely... .
4)I appreciate your reply and I am not trying to sell you on the CASM mount but I will reply to errors in your post. I also take no offence at what you wrote as you shouldn't when I say that I would not change the CASM scope mount for your design option. Your so-called improvement will not work on every M14 rifle like the CASM scope mount does out of the box because you are inclined to use an out of spec. stripper clip guide dove tail slot. The CASM is a light weight scope mount design that uses 7075 series aluminum and being that it is set up in the rear sight pocket provides the shooter a rifle that is nicely balanced in comparison to a more forward mounting option. This is the same design philosophy I put into Blackfeather: balance, weight, strength in that order, one not far behind the other so to speak. Cheers for now.
First off adressing #1
I have worked a lot with alluminuim as a welder. both the cheap #### and the 7075. whithout exception I find
1)it has to much flex for "sold" construction. when i worked for a security company alluminuim gates and security doors failed to thiefs without much effort and the weight savings were moot in compairson to steel.
2)it wears out or cracks around stress points (bolts, weldment, any for of hole with a pin through it), on boats it always cracked, on bike parts it always elongated out of spec, on contruction it did both.
3) it takes on impurities making it weaker and un repairible. You have no idea how many million dollar boats I have seen condemed because they can't be rewelded after a piece of driftwood punched the hual (because it was so brittle from salt and unweldable) and head ache racks on big rigs that get throughn in scap bins because they cannot be fixed because of road salt seeping in after the paint peeled. on guns it soaks up carbon and makes it take forever to clean.
2) the example I gave is that the presure exserted by droping the rifle from shoulder hight on a 18 inch pry bar (scope) on the falcrum point of your site ears is greater then the force of droping the rifle from a building (1 story) on the iron sites. the presure exserted on the scope in this instence is far less then what the site ears bear. even with a 5 inch wrech I can break a 1/4 inch bolt head off with one hand, with a 18 inch wrech I with one hand i can break a 3/8ths bolt like its nothing, imaginge what i could do to the site ears on a cast reciever with that much levrage.
3) it is a 1 point (the falcrom point of the ears, even though it is two srews it is still a single point) with tension screws on either end that not only tension against each other, but agaisnt the site ears. this is a lot of stress. those ears were not designed for what 20, 30 even 40 LB of presure from the site mount that is required to stop the hop during firing. let alone any wacks that come along, I have hit guns of trees, branches even had a rifle launch 6 feet infront of me when I bailed hard in the bush while hunting.
4) the striper clip guides... yes they can be out, but not by that much, a set of shims,a oval hole in the exsiting mount stystem, a piece of steel (that fits in the stripper clip guid) and screw and you fix the over tortion of the ears and the out of spec showed in the above pictures that occurs during tentioning (and it has to in order to get enough tension to stop movement). it turns the mount into a true two FIXED point mount without the requirement to apply tension to the ears, infact it protects the ears from damage on a side hit on a scopeand deflects it to the pin that retains the striper clip guide mounting piece. That pin is worth 2 cents instead of $450 (or $1000 on a LRB) reciever. you even keep the sweet profile of your mount, which to me is the most attractive feture.
I don't want to come across as a trolling retard.
I want to buy your mount, I love the profile and look, I love that your canadain; but I want to buy a version that does not require torquing on the site ears to keep it pinned in place.
Interesting comment and I appreciate your experience with this material. The MATWEB material data sheet for the 7075 series aluminum we use for the CASM scope mount is illuminating. In real world performance, and 1000 round range trials during prototyping and later, during Blackfeather's testing, we found the mount to be reliable and consistent. I am not sure what else to add here.
I will disagree with these comments. This has never happened.
The sight ear holes are 5mm thick steel. As mentioned, the CASM strengthens the connection here unitizing the receiver sight ears to the mount.
I would say more than half of my customers are buying CASM scope mounts and coming off the Brookfield-inspried scope mount designs because they are fed up with having to tweak their mounts due to shimming, tweak their rifle bolt parts because of cartridge case jams or worse, losing zero due to mount shift. I know my scope mount does not lose zero and I know it does not shift. I can't add more to the discussion right now, thank-you.
