Help building custom tungsten buffer weights for Maxim CQB

[SixPence]

I have a home built AR9 built on a CMMG RDB carrier kit, paired with a Maxim CQB stock which came with a standard weight buffer. I also purchased a Maxim H1 buffer to try out. I have been playing around with the buffer weights and have wanted to try a heavier H2 or H3 buffer for the type of ammo I want to use.

I would like to not buy a whole new buffer kit at about $100 each, so I reached out to Maxim Defense requesting if I could buy the separate weights. As you may know, the Maxim CQB uses a proprietary shorty buffer:

Milspec buffer weight diameter: 0.55in
Maxim buffer weight Diameter: 0.625in (5/8in)





Well Maxim returned my email simply stating they only sell the weights as a kit. So you have to spend almost $100 for a whole kit instead of a simple tungsten weight.

So here is what I would like to do, I would like to make custom weights for the Maxim CQB stock and brace for a lower cost than $100 each. I can buy 5/8in tungsten and steel stock for a nominal cost. I need to find an effective way to repeatedly cut these at the same length.



Here are the measurements I have so far:

CQB weights diameter: 0.625in (5/8in)
CQB weights overall length: 24mm (23.75mm on the H1)

CQB rubber pad: 1.6mm

CQB H1 tungsten weight length: 8.6mm (0.34in)
CQB H1 steel weight length: 13.5mm (0.532in)

I will need to get a scale with a proper range to estimate mass to cylinder size, as my reloading scale is too low a range. According to my estimates of mass per material:

304 stainless steel: 7.93g/cm3
Tungsten: 19.3g/cm3

[kcstott]

You're going to find out it would be far cheaper to buy the kit.

Any shop that has the knowledge and skill to cut tungsten is going to want a few hour minimum.

Also your math is wrong. it's 9.168 grams not Kg

[SixPence]

You're going to find out it would be far cheaper to buy the kit.

Any shop that has the knowledge and skill to cut tungsten is going to want a few hour minimum.

What can be done with a 6in abrasive wheel? If this can be done consistently, I would be looking to sell the extras I am able to make.

I already have one of these mini saws.

https://www.harborfreight.com/6-in-55-amp-cut-off-saw-61204.html

[kcstott]

What can be done with a 6in abrasive wheel? If this can be done consistently, I would be looking to sell the extras I am able to make.

I already have one of these mini saws.
https://www.harborfreight.com/6-in-5...saw-61204.html

Again, A shop with the skills and knowledge of cutting tungsten is not going to be cheap. You go ahead and give that little saw a try and the wheel will be gone before you can make a sizable nick in the rod. Tungsten is extremely dense and difficult to cut. it usually requires diamond abrasives or edm. This depends on the alloy you are trying to use, Pure tungsten is brittle so is tungsten carbide. Copper tungsten might be a better choice but it's not cheap.
Save yourself the frustration and just buy their kit.

[kcstott]

you realize you could buy a box of TSS shotgun shells cut them apart and fill your buffer with it. that would be cheaper still then their kit or you trying to make weights.

[ar15barrels]

I have a home built AR9 built on a CMMG RDB carrier kit, paired with a Maxim CQB stock which came with a standard weight buffer. I also purchased a Maxim H1 buffer to try out. I have been playing around with the buffer weights and have wanted to try a heavier H2 or H3 buffer for the type of ammo I want to use.

I would like to not buy a whole new buffer kit at about $100 each, so I reached out to Maxim Defense requesting if I could buy the separate weights. As you may know, the Maxim CQB uses a proprietary shorty buffer:

Milspec buffer weight diameter: 0.55in
Maxim buffer weight Diameter: 0.625in (5/8in)





Well Maxim returned my email simply stating they only sell the weights as a kit. So you have to spend almost $100 for a whole kit instead of a simple tungsten weight.

So here is what I would like to do, I would like to make custom weights for the Maxim CQB stock and brace for a lower cost than $100 each. I can buy 5/8in tungsten and steel stock for a nominal cost. I need to find an effective way to repeatedly cut these at the same length.



Here are the measurements I have so far:

CQB weights diameter: 0.625in (5/8in)
CQB weights overall length: 24mm (23.75mm on the H1)

CQB rubber pad: 1.6mm

CQB H1 tungsten weight length: 8.6mm (0.34in)
CQB H1 steel weight length: 13.5mm (0.532in)

I will need to get a scale with a proper range to estimate mass to cylinder size, as my reloading scale is too low a range. According to my estimates of mass per material:

304 stainless steel: 7.93g/cm3
Tungsten: 19.3g/cm3

Assuming you already know about crankshaft balancing weights like these:

https://abs-products.com/product/heavy-metal/

Call them and have them quote you for finish sized weights for your application.

[CamW]

Will the weights in this kit work for you? Only $45

https://www.jsesurplus.com/kakar-15configurablebufferkit.aspx

[ar15barrels]

Will the weights in this kit work for you? Only $45

https://www.jsesurplus.com/kakar-15c...bufferkit.aspx

No.
He is working with a nonstandard buffer system that uses larger diameter weights than a mil-spec type buffer.

[SixPence]

You're going to find out it would be far cheaper to buy the kit.

Any shop that has the knowledge and skill to cut tungsten is going to want a few hour minimum.

Also your math is wrong. it's 9.168 grams not Kg

Roger that on the math. Other than the misplaced decimal, is my estimation of the mass correct?

I sent some inquiries on Alibaba. Depending on the feedback I could get on the interest for this, it might not be that expensive. All depending if a combination of steel and tungsten weights totalling a length of 24mm could be used to equate to the mass of a H1, H2, H3 buffer, etc.

[DrJeds44]

I have a home built AR9 built on a CMMG RDB carrier kit, paired with a Maxim CQB stock which came with a standard weight buffer. I also purchased a Maxim H1 buffer to try out. I have been playing around with the buffer weights and have wanted to try a heavier H2 or H3 buffer for the type of ammo I want to use.

I would like to not buy a whole new buffer kit at about $100 each, so I reached out to Maxim Defense requesting if I could buy the separate weights. As you may know, the Maxim CQB uses a proprietary shorty buffer:

Milspec buffer weight diameter: 0.55in
Maxim buffer weight Diameter: 0.625in (5/8in)





Well Maxim returned my email simply stating they only sell the weights as a kit. So you have to spend almost $100 for a whole kit instead of a simple tungsten weight.

So here is what I would like to do, I would like to make custom weights for the Maxim CQB stock and brace for a lower cost than $100 each. I can buy 5/8in tungsten and steel stock for a nominal cost. I need to find an effective way to repeatedly cut these at the same length.



Here are the measurements I have so far:

CQB weights diameter: 0.625in (5/8in)
CQB weights overall length: 24mm (23.75mm on the H1)

CQB rubber pad: 1.6mm

CQB H1 tungsten weight length: 8.6mm (0.34in)
CQB H1 steel weight length: 13.5mm (0.532in)

I will need to get a scale with a proper range to estimate mass to cylinder size, as my reloading scale is too low a range. According to my estimates of mass per material:

304 stainless steel: 7.93g/cm3
Tungsten: 19.3g/cm3

Are you really complaining about spending a hundred bucks in 2022? Maybe shooting is the wrong hobby for you.

[DrJeds44]

I would have to assume your time is worth more than the cost of buying what you need. But maybe this an exercise to see if you can find an alternative. Have fun with your endeavor.

[kcstott]

Are you really complaining about spending a hundred bucks in 2022? Maybe shooting is the wrong hobby for you.

He's going to spend 3x that screwing around wasting time. then it's going to cost him 4x that to have a custom weight made.
There's always one that thinks they can do it faster cheeper

[kcstott]

Roger that on the math. Other than the misplaced decimal, is my estimation of the mass correct?

I sent some inquiries on Alibaba. Depending on the feedback I could get on the interest for this, it might not be that expensive. All depending if a combination of steel and tungsten weights totalling a length of 24mm could be used to equate to the mass of a H1, H2, H3 buffer, etc.

your estimation of mass is just that, an estimation, this all depends on alloy. your numbers are most likely pure tungsten which is not going to be what you get.

Have fun. You would have had your weights if you would have just ordered them.

['ol shooter]

"A man's got to know his limitations"- Dirty Harry Calahan

[SixPence]

I could outsource this to Chyna and get them made in bulk easily. Already made some contacts. Question is, is there a demand for this?