Modern Sporter Update April 5th 2018

Oh please be non restricted. Lol. It’s this or the stag. This is more affordable to shoot so....

As far as billet vs forged would forged not be stronger or harder due to the forging compacting the metal process? Or am I wrong
 
alberta tactical rifle said:
You are not too far off but it is closer to 95%. The billets weigh 10 lbs before a tool touches them, the finished stripped lower weight .6 lb
Click to expand...

I have to ask from pure manufacturing background. Why is there so much extra material on the top and bottom billet. You could start with a smaller piece and still get the same result?

I'm assuming it is for stability when milling but the pics seems overkill? Id hit my CNC guys if they started with material that big but we also make furniture not really high precision stuff.
 
YoungestPiperCub said:
I have to ask from pure manufacturing background. Why is there so much extra material on the top and bottom billet. You could start with a smaller piece and still get the same result?

I'm assuming it is for stability when milling but the pics seems overkill? Id hit my CNC guys if they started with material that big but we also make furniture not really high precision stuff.
Click to expand...

Mostly due to the fact that unless you get a mill to produce literally tons of a specific size, you are stuck with what is available. The closest common size is 2x6". Ideally 1.75x5" would work, but we only needed 1 ton of material so not a big enough order to get a special run done.
We need 1/4" on the bottom to hold the part in the fixture securely during the roughing stages where up to 3/8" is being taken off in each pass of the tool. Having a 10 lb block of barstock come out of the fixture when the tooling is spinning at 12000 RPM is NOT cool!
 
GaryF said:
I was thinking that too...also why do some have twice as many tool passes as the others?
Click to expand...

Roughing and finishing. We are taking off a large amount of material with the first and often second pass of the tool and then only a few thou with the second or third pass. This extra pass takes time but leaves our products with the high quality finish that we are know for.
 
Looking at that slab, it looks like more receivers could be machined out of it if the were rotated and staggard. How come this isn't done? Just curious, not criticism.
 
Gobc said:
Looking at that slab, it looks like more receivers could be machined out of it if the were rotated and staggard. How come this isn't done? Just curious, not criticism.
Click to expand...

They're machined one at a time (not in a big slab), the actual time and material you'd save doing 2 in a billet wouldn't be worth it.
 
F22_RaptoR said:
They're machined one at a time (not in a big slab), the actual time and material you'd save doing 2 in a billet wouldn't be worth it.
Click to expand...

Not to mention that the fixturing would be a nightmare. Total time to rough out both lowers in op 1 is under 5 minutes. we could cut that time down but at the cost of dimensions and tooling suffering.
 
Patriot762x51 said:
I hope the brass deflector is solid and not screwed on the upper.
Click to expand...

It will be retained by a screw, The deflector sits in a pocket that is milled into the upper. we have been employing this style for many years now and have thousands of rifles out in the world with these retained in this manner and have not experienced a single issue.

To integrate the shell deflector into the upper requires large bar stock, which increases waste and price of the finished part.

We may go with integrated shell deflectors in the upper that have forward assist, but we are still contemplating the forward assist feature as it is for the most part a useless feature. The deciding factor will be what guys want when we get around to starting on the uppers. Majority will dictate.
 
alberta tactical rifle said:
We may go with integrated shell deflectors in the upper that have forward assist, but we are still contemplating the forward assist feature as it is for the most part a useless feature. The deciding factor will be what guys want when we get around to starting on the uppers. Majority will dictate.
Click to expand...

I'm definitely hoping for a forward assist version, just looks a little off without one.
 
I'm liking the idea of NOT having a forward assist, the Magpul MBUS offset that i have would be nice to push a little further forwards and not have the charging handle so cramped.

Besides, the little cutout in the bolt group can be used as a forward assist if you need it, if slowly riding the charging handle home is your plan (makes sense in varmint hunting and not wanting to disturb things)
 
You must log in or register to reply here.
Back
Top Bottom