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It has been done, there is a picture floating around this forum of a rifle someone has done that to.
I'd be interesed in seeing some up close pics of how they did the bolt catch. I am working on an 80% lower myself (for a prototype replica), and I decided against removing the raised area on the left side of the magwell. With the lower I have, it could have been done, but by my estimate there would have been .020 or less material in that area. That's getting mighty thin, and I sure wouldn't want to engrave there. I'm sure someone out there has the skill and tools to fill that area from the inside, but then you get into the additional cost, plus figuring out how to get a magazine to work. I did do some other mods to my 80% receiver. I should have it back from the engraver in a week or so. I'll post some pictures when I get it back. John Thomas |
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A member has done one,I thought last time this question popped up the it was peepshowal,but he corrected me,but son of a gun,I can't remember who it was.But bottom line,the ears were removed,a channel was cut from the top of the receiver sidewall down to the depth needed,and I believe the hole in the bolt catch needed to be welded over and new hole drilled (NOT sure about that).So basically,the roll pin would be inserted into the bolt catch,then the unit was dropped in from the top.Does this make sense??
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A member has done one,I thought last time this question popped up the it was peepshowal,but he corrected me,but sone of a gun,I can't remember who it was.But bottom line,the ears were removed,a channel was cut from the top of the receiver sidewall down to the depth needed,and I believe the hole in the bolt catch needed to be welded over and new hole drilled (NOT sure about that).So basically,the roll pin would be inserted into the bolt catch,then the unit was dropped in from the top.Does this make sense?? That sounds right from what I remember reading, I remember the talk of milling the channel out, but man... I wonder how the originals were made? I would think there was some way of removing the bolt release. Any AR10 owners out there with some insight/pictures? John Thomas |
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I found this thread on an AR-10.
http://www.ar15.com/forums/topic.html?b=3&f=62&t=501546 If you look at the first picture, there appears to be a single tiny hole for a pin of some kind. Without seeing the inside, or the rest of the parts, it almost raises more questions than answers. |
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This is a different view of the same reweld. A funny dowel goes through the pivot hole in the bolt catch. That funny dowel has a little bitty hole in it which lines of with the pin hole you noticed in the left side of the receiver. If you like I could get photos of all these AR10 parts. Yes, I would love to seem them. I don't see why these couldn't be machined, cnc'ed or other wise, as long as the steel is properly hardened. |
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Here are some photos. The side view photo below shows the funny dowel sitting on top of the lower. Once the dowel goes all the way inside you can see how the little pin holes will line up. If I had put the bolt catch in place then none of this would be easily visible. The next photos shows a view where you can see how then funny dowel and bolt catch fall into place. Finally, here is a family photo. The middle one is for the later Portuguese AR10 because I do not own or need an earlier bolt catch. The one on the right is a generic AR15 catch. Using the dowel hole as basis, the AR10 catch level sticks out the side of the receiver much father than the AR15 catch would. Now on the left is a broken AR10 catch. That is why nobody would ever sell an extra AR10 bolt catch to anyone who would use it other than on another AR10. Thanks for the pictures. That clears it up. One more question. I guess to remove the tiny roll pin that holds the "funny dowel", it has to be driven all the way though from the outside in, then the tiny roll pin drops out the magazine well? That's the only way I can see getting the tiny roll pin out. Is this correct? Man, it would be super if someone could make some bolt catches like this. Thanks again, John Thomas |
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The little bitty pin is pushed all the way through to remove it.
Is there anyone with enough metals and fab knowledge to confirm that a bolt catch from CNC might be ok? Not ok? |
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Is there anyone with enough metals and fab knowledge to confirm that a bolt catch from CNC might be ok? Not ok? I'm no expert, but it looks like the part could be machined either on a CNC or a regular milling machine. I'm sure you'll get feedback on that. John Thomas |
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The older style (Sudanese) bolt catch is interchangeable with the later (Portuguese). However, the Sundanese lowers did bot have the little bitty pin hole. Instead I believe that the funny dowel was jammed in place. Got it... it would be held in place by the installed upper receiver. John Thomas |
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I was going to ask....why the dowel that the bolt release pivots on could not just be jam or pressure fitted?
Have it bottom out in the cavity, and long enough to fit flush with the upper edge of the lower, held in place by the upper??? |
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Thanks very much for the pictures. Those go a long way toward explaining how these things were put together.
Is that AR-10 lower cut in half? That's a real shame there's not a lot of love for those early guns. I love the look of them myself. The very first ones with the massive flash hiders are my favorite. I don't think it'd be any trouble at all to get some bolt catches machined. Going over it in my head, I could probably do it with a small block of steel and some time on a mill. If I could just get a mill. You really don't appreciate them until you don't have one. I would think any small parts shop would be able to do it however. Not sure on the cost though. |
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Yes, the lower has been hack-sawed. Many of the old ones were emasculated that way when it was sufficient. Now I think the ATF would recommend or require running over it with a bulldozer. Saw-cut AR10 lowers are easy to come by and more than a few folks have contemplated and accomplished a rejoining of sorts.
If the bolt catch could be CNC'ed then I wonder why it has not already been done for the AR10's? For retros maybe it would be as simple as cutting and rejoining an M16 bolt catch, adding more distance between the lever and the lower!?!? Could a bolt catch be successfully welded anyhow? |
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I would imagine the lack of AR-10's on the market would limit the demand. Most people probably don't shoot them or shoot them very little to avoid breaking the hard to find parts. As for welding a bolt catch, I would imagine you could. I'm not sure how it would hold up though.
A discussion in another thread brought up a potential dilemma. It would appear the 80% lower I planned on using comes pre-marked with "SAFE" and "FIRE". This is not good. The benefit of using an 80% is lost because of this. I would just buy a blem NDS 601 lower and be half there already. Question that arises is, how would I go about re-marking a lower that is already engraved? Could I grind away the current "FIRE" and "SEMI" markings? Maybe filling them with JB weld and stenciling the markings on then covering the whole thing with some type of hard core clear coat would be better? |
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I would imagine the lack of AR-10's on the market would limit the demand. Most people probably don't shoot them or shoot them very little to avoid breaking the hard to find parts. As for welding a bolt catch, I would imagine you could. I'm not sure how it would hold up though. A discussion in another thread brought up a potential dilemma. It would appear the 80% lower I planned on using comes pre-marked with "SAFE" and "FIRE". This is not good. The benefit of using an 80% is lost because of this. I would just buy a blem NDS 601 lower and be half there already. Question that arises is, how would I go about re-marking a lower that is already engraved? Could I grind away the current "FIRE" and "SEMI" markings? Maybe filling them with JB weld and stenciling the markings on then covering the whole thing with some type of hard core clear coat would be better? I just posted instructions and a pic on the other thread regarding removing the safe fire. I also have it on GOOD authority that a member may well be offering bolt stops you need when he finishes perfecting his method! ETA,YOU CAN NOT ANODIZE OVER JB WELD,it's an epoxy.Anodizing will only adhere to aluminum. |
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Will that method work on an already milled out lower? I'd imagine I'd need to shove some steel stock into the recess to support it and be a bit more gentle.
More importantly, could I still engrave/etch over that? |
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I think that if you do a good cleaning job, fill, and dress down JB weld they can engrave thru/over it.
I have had it done, the engraving was great, but my finishing of the lower was not as good as it should have been. |
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Wow, you can't tell there was ever anything there. Thanks for the information on this, if the 80%'s don't work out, this'll be the way to go for sure.
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Wow, you can't tell there was ever anything there. Thanks for the information on this, if the 80%'s don't work out, this'll be the way to go for sure. Ahhh,octane,this was an 80%er from Tactical Machine.. This one was bought this past Feb or March and DID have the safe/fire on it.But JT has just posted that he received his TM in June and it had no markings on it. Just want to clarify. |
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No,antique drill press,and dremel and plenty of hand filing,that's why the rear detent hump ain't so great.View this thread and see what I used for removing the fence and the buffer tower re-inforcing,then used smaller dremel bits.http://www.ar15.com/forums/topic.html?b=3&f=123&t=504067
ETA for the inside finish work,and pin holes I have the CNCGunsmithing jig set and also use the antique drill press for that as well. |
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To quote m1sniper:
I also have it on GOOD authority that a member may well be offering bolt stops you need when he finishes perfecting his method!
Are you talking about vintage AR10 or AR15 bolt stops? I recall the production AR10 bolt stops were made from lost wax castings. Am looking for the reference. |
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To quote m1sniper: I also have it on GOOD authority that a member may well be offering bolt stops you need when he finishes perfecting his method!
Are you talking about vintage AR10 or AR15 bolt stops? I recall the production AR10 bolt stops were made from lost wax castings. Am looking for the reference. The finished product will look like the AR10 one you guys were talking about up top,but for use in the AR 15 lower for the potential build you guys are wanting to do..Round button head and then extending down flat like the one in the pic posted up top somewhere in this thread .The member sent me pics of before,during,and an almost complete one he has done,specifically for what you guys are in need of.I am NOT at liberty to give his name at this time.When he's ready,he will make them available.He asked my opinion on his work to date,and I think they look great! |
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That's exciting news. I've drawn up plans for an edgewater look-a-like. It won't function like the real thing but, it'll look like the real thing. I'm following a few leads and trying to get one machined for a reasonable price.
Also, I'm tossing around the idea of using one of the A2 lowers that NDS is selling at an absurdly low price. It's kind of a difficult choice, either way I go, I'm in for a lot of detail work. |
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I think I'm fairly certain as to which direction I'm going to take this but, I wanted to ask one more question.
I'm thinking it's probably a bad idea to take a torch to a lower and fill in the engravings with some aluminum brazing rod? What kind of horrible things might happen if I did that? |
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Well,I don't know for sure about brazing but can add this info.I had a lower engraved by Ident.A little mistake was made.They took it back and welded it over.A special rod/wire was needed that was specifically for 7075 T6 aluminum.The finished product looked great,HOWEVER,I was forwarned by Ident and Victor that the anodizing would show up with a blemish in the welded area.They both said will,,,not might.They could not say just how noticable it would be,,,BUT it would be there.I have not had it anodized as I ran into a different problem involving a snapped drill bit in the rear takedown detent hole.
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I think I may end up painting the end result, whatever it may be, just for simplicities sake. Might run a little DIY anodizing to protect the surface but, nothing more. At this point, weighing in all the variables, I'm thinking the 80% route is the way to go. Of course, I'll email them first and make sure they're not engraved just to be on the safe side.
I'm still going to experiment with the brazing though. I think I'll run a few tests with some scrap aluminum I have. It works at a fairly low temp but, it might still be high enough to cause some damage. I'll try a few different techniques and report back. |
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I think I may end up painting the end result, whatever it may be, just for simplicities sake. Might run a little DIY anodizing to protect the surface but, nothing more. At this point, weighing in all the variables, I'm thinking the 80% route is the way to go. Of course, I'll email them first and make sure they're not engraved just to be on the safe side. I'm still going to experiment with the brazing though. I think I'll run a few tests with some scrap aluminum I have. It works at a fairly low temp but, it might still be high enough to cause some damage. I'll try a few different techniques and report back. might want to add some of this stuff to your experiments to see how well it works at filling in engraving and taking anodizing http://durafix.com/ |
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