Posted: 1/28/2007 1:20:46 PM EDT
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I was wondering if one of you guys could post some detailed pictures of the modifications that are made to your straight pull AR BCG's and upper receivers. I'm thinking of putting one of these together for use as a teaching tool with new shooters. I know nobody has more experience with this format than you guys. Thanks in advance for the help.  |
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OK, I said I'd post something tonight, so here goes. I've done so many of these conversions I've lost count, but it must be somewhere between 75-100  There are various ways to do the mods, depending on what type of receiver you use. The simplest way is to use a DPMS Lo Pro receiver. These don't have a forward assist or case deflector on them so the machining is pretty straightforward .jpg) This one was a DPMS Hi-Rider that we cut the rail off and fitted an extended one. This receiver is actually from Southern Gun and the slot work is theirs. All I did was plug the existing hole in the carrier and make a new handle for it. I don't like this slot placement as although all you are doing is extending the original ejection port, I feel thet the handle ends up sitting at the wrong angle. Here is another DPMS upper before any work is carried out .jpg) This is an Ameetec upper. Like some of the DPMS uppers, it has l/h side charging .jpg) .jpg) As you can see, I prefer to lower the ejection port. You do this until the bottom rail on the carrier can just be seen. These receivers are easy to work on as again, there is no forward assist and the phoney case deflector can be milled straight through and doesn't need to be removed. I have found these receivers to be a little soft. I must add that when you do any of these mods and make a cocking handle for it, you have to machine a radius on to the mounting face of the handle to match the radius on the carrier. A 25mm milling cutter does it just fine but you will have to adjust the position until you get the handle sitting at the correct angle. While we're talking about carriers, i must make you aware that the carriers can be as hard as nails, and I've lost more than a few drills and taps on them. Once you break the surface, it's ok, and one of the best things I've found for getting through the surface is a good old carbide masonry bit  The problem with the forward assist is that the hole means that you have to machine the slot further back than the ideal Here is a receiver that's had all the lumps and bumps taken off before slotting .jpg) You can see the forward assist hole Here it is after slotting .jpg) And here it is after making and fitting the handle .jpg) I used to use a polyurethane paint to finish them, but now I powder coat. .jpg) This is my Highpower rifle. I modified this one 3 years ago and it's still going strong .jpg) This is another one I did %20002%20(Medium).jpg) This is one of the earlier ones .jpg) Another shot of the DPMS upper .jpg) And finally, this is one I did for some Gangsta's  .jpg) Mark |
I understand your point, but not every firearm I own is a semi-auto. I have a couple of reasons why I would want to do this. I teach a few different safety classes, and I think a straight pull AR might be a great tool. With younger shooters I think this would lend it self to much more deliberate shooting. Also, I have assembled AR's in many different configurations, why not this one? -Ralph |
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No anodising Mark? eta, i may have just the drill bit for this application in my tool box Mark, sell centreing solid carbide ticn coated, 5.1mm we used to use them for drilling en24 to tap using speacial high torque taps, i cant rember if i handed tham back into the stores or not... i'll check when i get home. |
The anodizing's the pain as all the old finish has to be stripped off and as it eats into the surface, the dimensions change. I've had no problems with the powder coating |
