Super Safety Review
- Thread starter strobro32
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I actually got it down to 488 RPM but it did not feed reliably.
JRC 8.5" buffer tube, 3/4" spacer, Tubbs 5.56 flatwire spring, 10.5 oz KVP buffer. An A5 tube would do it without spacer. I just wanted more tuning options.
JRC 8.5" buffer tube, 3/4" spacer, Tubbs 5.56 flatwire spring, 10.5 oz KVP buffer. An A5 tube would do it without spacer. I just wanted more tuning options.
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The ROF changes with the order the parts in the buffer tube. This is something I learned from Amphibian's and Blowback9's research and when I had a configurable BRP U9/U45 SMG.
JRC 8.5" buffer tube + 3/4" Delrin spacer + Tubbs 5.56 flatwire spring +10.5 oz KVP buffer= 536 RPM
JRC 8.5" buffer tube + Tubbs 5.56 flatwire spring+ 10.5 oz KVP buffer + 3/4" 2.5 oz SS kynshot spacer = 620 RPM
Parts In that orders. You can see the ROF would change when there is space or weight before or after the spring, different springs, buffers or tube lengths. Just make sure the gas key can not hit the lower.
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ericthered
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Isnt the 620rpm setup basically making your 8.5" buffer tube into an A5 buffer tube? If I am reading this right, your basically removing reciprocating weight. While maintaining the exact same stroke length as the heavy weight option.
Which you have just a delrin spacer on the 536 setup and the 2.5oz on the 620. Is the point that the longer reciprocating column that is nearly the same weight is the slower?
Keep in mind this is a CMMG 45 RDB upper. This is not a blow back upper. But it also applies to DI/piston rifel uppers.
carbine buffer tube is 7"
A5 buffer tube is 7.5-7.75 inches
JRC buffer tube is 8.5 inches
A rifle buffer tube is 9 inches
The 620 RPM is not set up is like an A5 because the tube is longer and there is no space behind the spring. A 2.5oz SS spacer is in front of the 10.5 oz buffer (combined weight of 13 oz) adding more weight to the buffer.
The 536 RPM is kinda like an 7.5" A5 but adding another 1/4" behind the spring and only a 10.5 oz buffer in front of the spring.
Basically adding or removing buffer travel (through tube length and/or shorter flat springs compression) and/or adding or removing weight to the buffer changes ROF.
Add the Kynshot 6oz hydro RB5007/RB5015HD buffers, Nemo/Worthog/Tubbs 300BO/ 5.56 flat wire and round carbine springs to makes more variables.
So do 1/4", 1/2", 3/4" and 1"spacers, in the spring (top hat), behind the spring. Just make sure the gas key does not hit the lower.
Then there is playing with the gas settings on DI uppers.
The Super Safety has opened up new territory to explore. It's similar to what can be done for FA but also different.
carbine buffer tube is 7"
A5 buffer tube is 7.5-7.75 inches
JRC buffer tube is 8.5 inches
A rifle buffer tube is 9 inches
The 620 RPM is not set up is like an A5 because the tube is longer and there is no space behind the spring. A 2.5oz SS spacer is in front of the 10.5 oz buffer (combined weight of 13 oz) adding more weight to the buffer.
The 536 RPM is kinda like an 7.5" A5 but adding another 1/4" behind the spring and only a 10.5 oz buffer in front of the spring.
Basically adding or removing buffer travel (through tube length and/or shorter flat springs compression) and/or adding or removing weight to the buffer changes ROF.
Add the Kynshot 6oz hydro RB5007/RB5015HD buffers, Nemo/Worthog/Tubbs 300BO/ 5.56 flat wire and round carbine springs to makes more variables.
So do 1/4", 1/2", 3/4" and 1"spacers, in the spring (top hat), behind the spring. Just make sure the gas key does not hit the lower.
Then there is playing with the gas settings on DI uppers.
The Super Safety has opened up new territory to explore. It's similar to what can be done for FA but also different.
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ericthered
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Ok, interesting. I will do some testing.
It seems from reports, that FA uses energy a little less efficiently then the SS. While the FA needs energy right when the bolt is seating home in order to trip, the SS uses the most energy when the bolt is traveling rearward. Just from observation, and my experience with the SS, the SS seems to always run faster then a FA with the same setup. It would be really interesting to see direct head to head comparisons with the same tuning.
It seems from reports, that FA uses energy a little less efficiently then the SS. While the FA needs energy right when the bolt is seating home in order to trip, the SS uses the most energy when the bolt is traveling rearward. Just from observation, and my experience with the SS, the SS seems to always run faster then a FA with the same setup. It would be really interesting to see direct head to head comparisons with the same tuning.
Wow, didn't realize there was all this testing going on and I wasn't invited to the party!
Regarding the magnetic buffer see this thread on Reddit:
Guy is saying that the magnetic buffer magnetizing the carrier which in turn attracts the SS and causes issues.
I posted that it shouldn't be an issue with an FRT like the RB, Partisan Disruptor or maybe the AZ Regulator.
Again, I'm in FL and don't have any of these.
I also put this picture up on my site regarding the FE Banshee carrier detent channel being an issue with SS's.
So that is another reason an FRT may be better suited for the FE Banshee.
I have a FE Banshee in .45 aslo but I just don't shoot .45 enough. I tested it with my ARS setup and it ran fine and I put it away. Too busy playing around with 9mm.
Picture below is what I ran at the last SMG match (9mm).
The Miculek magnetic isn't reliable in full auto for me in the 9mm CMMG RDB. I would suspect it woudln't be reliable in .45 either. As you can see in the picture above, I modified mine with a Tungsten insert. The buffer is also 'permanently' assembled so you cannot swap out the plunger.
I have now made my own that is intended to be fully taken apart so I can swap plungers of different weights and lengths as well as use spacers instead of relying on a screw to adjust the strength.
Again, my goal here is a slow cyclic rate (around 600RPM) but with the lowest amount of reciprocating mass as possible. In the picture above, my lightened carrier is 9oz and with the 3.7oz magnetic buffer I'm at 12.7oz of total reciprocating mass which is insane to me. I don't think there is any closed bolt 9mm SMG that can shoot that slow with this low amount of mass. For that matter even considering an open bolt SMG, the bolt is going to weigh more than this as well.
Once I am happy with my own magnetic buffer, I want to see if I can do the same thing in .45ACP with low mass and a slow cyclic rate with my 45 FE Banshee.
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ericthered
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I hadnt heard about the Miculek's magnetizing the lever. I know a lot of levers come in all flavors of metal. Sounds like if someone had their heart set on a Miculek buffer they would need a stainless steel super safety.
Yeah...but like I mentioned, the stock Miculek isn't reliable in full auto and most likely will have bolt bounce issues with an FRT / SS as well I presume. So you would need to modify it like I did or make a whole entire new one like I'm doing..... I doubt there are that many people out there like me that will go through all the trouble.
ericthered
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The SS is a lot more sensitive to bolt bounce then the frt. IME
ericthered
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I was referring to them separately as the mechanical operation is different between say a rarebreed and a super safety. Yes, the SS is an FRT. The SS wont tolerate any bolt bounce. It will do hammer follow. I have only messed with a WOT (original rarebreed knockoff) and its only strongpoint imo is its relative insensitivity to bolt bounce.
So yeah, they are all the same concept. But iff discussing technical things it is best in my opinion to seperate them out into their trade names. A diesel motor is a diesel motor. But if we were discussing fuel systems, it would be good to know if it is a poppet, oil pressure, or piezo electric injection. And then the sub types of those. So just being pedantic for clarity.
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