If you machined the "nipple" as more of a rounded cone shape, i.e. with a taper to the sides and a domed end, would it retain its full anit-tilt properites AND allow for easier dissasembly?
Like a very large detent?
Just wondering aloud...
-RD62
I went against that idea because in the tilt action, along with rearward movement, theres is a "shear" movement (the tilt downward). I saw that as being somewhat synonymous to the action of hinging the upper from the lower (a shear movement between carrier and buffer). I thought it best to have a full square shoulder for the carrier to bear on.
I did not try it, I just ruled it out in the design process.
Thanks for your reply,
Seth H.
This would be great on pistons - when available?
Im running one of these buffers with an Ares defense/Bushmaster piston conversion kit and it does work great on pistons.
It'll be a few weeks or more before available. I've just inquired about setting up a web site for this and other parts. Thats where most of my marketing will take place, hopefully. I have to do something for marketing, I cant do it in this thread unless Im a dealer. I'll make it known when its available without breaking the rules.
Thanks for your interest,
Seth H.
I would almost bet any or all piston uppers have this issue, in the AR platform. H&K and LWRC both I believe have a bulbous end on the back of their carriers that is just slightly smaller than the receiver extention, when the back of the carrier hits the floor of the tube it dosnt travel nearly as far.
I would imagine there is a little tilt in DI guns also, but with a push as opposed to an extremely hard punch, I think the tilt is negligible. That is not gospel by the way, just a common sence observation.
Not only that, but there must be an adverse effect of carrier tilt on the bolt itself. That moment arm is creating uneven stress/loading of the bolt's locking lugs and in theory could cause a higher incidence of catastrophic bolt/bolt lug failure.
Glad to see you are able to post this freely now Seth. I look forward to seeing this product's progress.
SLG Defense 07/02 FFL/SOT
Agreed, good point. Whats more is ares recommends you remove your gas rings from the bolt. When I did so, my bolt moved much more freely in the carrier and thus I would imagine giving way to the potential of adverse movement. All the more proof that carrier tilt IS NOT a negligible condition.
Josh thanks, you've been extremely helpfull, I look forward to seeing its progression also.
What I found out when I built my first prototype piston upper is that it was eating up the buffer tube and the rear inside of the upper.
In a DI upper the rear of the carrier is suspended in the center of the upper bore, held in place part by the slight pressure of the buffer via the spring, when it fires the carrier is pushed straight to the rear from the center of the carrier.
In the piston carrier, the piston pushes at the very top of the solid key making the carrier tilt and move from its center position in the rear towards the bottom of the receiver bore/buffer tube causing wear.
When I added pads to the rear of my carrier it allowed the pads to sit on the bottom of the receiver bore, therefore not allowing the carrier to tilt and hit the upper bore/receiver tube, it was already making contact, so it just goes straight back, no battering.........................................AD
I have been following the thread on your new upper. I found it very interesting so THANK YOU for commenting here it is appreciated.
I had many ideas for curing tilt for people by modifying the carrier and/or the extension itself. I wanted to go that route but the possibility of ruining peoples carriers somewhere in the annealing, machining and rehardening processes kept me from doing so. This being a drop-in part gets rid of the potential for ruining carriers, but machining carriers from the ground up... Making integral pads on the bottom rear makes perfect sense.
The only wear I experienced was in the extension just behind the buffer retainer pin and the unknown/unseen wear in the upper on the bearing surfaces, I found this unexceptable. In this system the nipple on the head of the buffer fits tight in the back of the carrier, zero wobble. The large shoulder just behind the nipple fits with little room to spare inside the extension. Thus keeping the rear of the carrier centered in the extension through the recoil and battery process. No tilt, beauty!
Thanks again,
Seth H.
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