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Old 02-21-2013, 09:09 AM #1
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Stainless or Aluminum Freak Inserts

Hey guys, I've been thinking about investing in a Deadlywinds barrel kit. Just wondering from your guys personal experience, which bore kit should I get? The stainless steel or aluminum?
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Old 02-21-2013, 09:58 AM #2
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I use the aluminum. Have not had any issues with them. I believe the aluminum are a little cheaper and lighter. The stainless are heavier but stronger. However IMO I dont think you should have a problem with bent/dented inserts as long as you store them in a insert case/barrel bag.
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Old 02-21-2013, 12:10 PM #3
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I dont see much of a difference between the stainless and aluminum inserts. It will depend on how much you want to spend.
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Old 02-22-2013, 07:17 AM #4
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great question! (I edited the title a little bit to make it more concise)

I've used aluminum without issue. Some say the stainless are more "durable", which is probably true - but if you don't mistreat aluminum inserts (ie: stepping on them), I don't see any drawbacks.
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Old 02-22-2013, 10:51 AM #5
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Besides the durability of the stainless I've also heard the tolerances are more accurate.
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Old 02-22-2013, 11:23 AM #6
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This is years ago but the tolerances on the stainless steel were better.

I have had numerous aluminum inserts that were clearly marked wrong ie; .687 was actually a .695
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Old 02-22-2013, 12:07 PM #7
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Stainless has better tolerance to temperature fluctuations. I have heard that aluminum inserts expand or contract in environments of extreme heat or cold. So playing in summer when it reaches 90+ can actually increase the bore size of an aluminum insert. Stainless bores are able to endure those extreme weather days.
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Old 02-22-2013, 09:22 PM #8
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SS is herned (dunno the real word) To a higher polish. Stainless steel is able to be polished to a higher (forgot the word again), which means less friction on the over-all control bore. In my personal opnion, SS shoots more ball-on-ball, but either will do the job.
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Old 02-22-2013, 10:27 PM #9
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the new gog stainless inserts do not really seem to have as polished bore as you would expect, i have a couple. aluminum can be fragile and easily bent. anno can wear over time.
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Old 02-22-2013, 10:56 PM #10
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I have both SS and alum Freak inserts. One thing I do know is the SS material on these inserts are not has hard as the SS material on fasteners or firearms. They actually scratch faster than my alum ones.
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Old 02-22-2013, 10:59 PM #11
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Quote:
Originally Posted by STRIP3S View Post
Stainless has better tolerance to temperature fluctuations. I have heard that aluminum inserts expand or contract in environments of extreme heat or cold. So playing in summer when it reaches 90+ can actually increase the bore size of an aluminum insert. Stainless bores are able to endure those extreme weather days.
If that is the case, then you need a SS back and not alum. In hot temperatures, the alum back will expand allowing the SS insert to shift or wiggle in it.

So alum inserts in alum backs will expand or contract together.
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Old 02-22-2013, 11:23 PM #12
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dont bring up temperature changes the variation is soo small you have a hard time measuring it with optical measuring devices (laser mic) let alone have it effect performance.

http://en.wikipedia.org/wiki/Thermal_expansion

cte values from mat web

6061-t6
1/F 0.000,013,1

316 SS
1/F 0.000,008,89

so if you start the day at 72deg and it warms up to 90

the rough calc would go (cte x delta t) x .700 so

ss = delta dim = 0.00012446
6061 = delta dim = 0.0001834
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Old 02-22-2013, 11:25 PM #13
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Originally Posted by Buster Hymen View Post
Besides the durability of the stainless I've also heard the tolerances are more accurate.
This is a fact I have many 689 inserts and they vary up to +0.003 from what they are marked. I have also found some inserts to have a concentricity issue.
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Old 02-22-2013, 11:32 PM #14
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Originally Posted by SilentBall55 View Post
I have both SS and alum Freak inserts. One thing I do know is the SS material on these inserts are not has hard as the SS material on fasteners or firearms. They actually scratch faster than my alum ones.
the annodizing process creates a layer of AlO3 or aluminum oxide it is extremely hard much harder in fact than 316SS. remember their is a difference between hardness and strength. You need to look at the ductility of the material and density and lots other variables but I am not going to go into them since they write books on the subject. suffice it to say the AlO3 coating on the surface of the 6061 inserts is more resistant to scratching than the relatively soft 316ss
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Old 02-22-2013, 11:35 PM #15
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so at the end of the day if I had to recommend one I would say go with the cheep ones since all things considered they end up being just about the same with both accomplishing the same task so why pay more than you have to.
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Old 02-22-2013, 11:50 PM #16
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Nerve, you are technically correct, which is the best kind of correct. You gave me a total engineering boner.
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Old 02-23-2013, 12:03 AM #17
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Old 02-23-2013, 09:31 AM #18
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I am not good at math, but my eyes can see scratches on SS. I have switched to alum long time ago.

I prefer alum inserts because they are lighter,cheaper and last longer than my SS inserts.

As for alum inserts being fragile, well they are being so thin. Once they are in the barrel back, it won't bend. I only bent two, only because those are .691 and .693. All smaller sized inserts have a thicker wall thickness.

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Old 03-29-2013, 09:34 AM #19
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Quote:
Originally Posted by big,bad,PAINTBALLER View Post
SS is herned (dunno the real word) To a higher polish. Stainless steel is able to be polished to a higher (forgot the word again), which means less friction on the over-all control bore. In my personal opnion, SS shoots more ball-on-ball, but either will do the job.
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Old 03-31-2013, 12:58 PM #20
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ive shot both, my ss are noticeably better. Shooting out of my luxe 2.0
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Old 03-31-2013, 01:51 PM #21
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i got a set of both and honestly don't see a difference. i have the Smart Parts All American front and Freak back with the viewable cut out window, so i tend to use the SS inserts...just so i won't have a colored insert showing through on a black and red gun. i use the aluminum inserts on my Deadlywind FIBUR barrel cause i can't see the insert.

also, i have yet to dent or bent anything on the aluminum inserts or have seen any scratches on my SS ones...but i do take care of my gear pretty well.

i would go with the aluminum ones, since like Nerve suggested, they basically do the same thing just ones cheaper. i just got the SS ones for cosmetic purpose.
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