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Good afternoon everybody and welcome again to TFB’s Silencer Saturday dropped at you by Yankee Hill Machine, producers of the brand new YHM R45 Multi-Host Suppressor. Final weekend we began off with an introduction to the most recent SureFire rifle suppressor, At present we evaluate the SureFire SOCOM556 RC3 to the venerable SureFire SOCOM556 RC2 on totally different barrel lengths of gasoline operated carbines. Is SureFire’s subsequent technology suppressor quieter than the RC2? Does barrel size matter? I believe everyone knows the reply to that… however let’s dig in anyway.
Extra SureFire @ TFB:
SILENCER SATURDAY #308: Barrel Lengths and the SureFire SOCOM556 RC3
As a quick recap, the SureFire SOCOM556 RC3 is a low again strain designed suppressor that has the very same specs of the SureFire RC2 suppressor. Identified for his or her sturdiness, repeatability, and strong mounting system, the SureFire suppressors have seen intensive use by each the navy and legislation enforcement companies all over the world. The transfer to include low again strain know-how utilizing direct steel laser sintering was derived from the necessity to make the addition of a suppressor to a rifle system a extra impartial occasion. That’s, historically designed suppressors can pressure extra strain into the motion, effecting the cyclic charge and ejecting poisonous gasses in the direction of the shooter.
In Silencer Saturday #274 we mentioned the SureFire Mini SOCOM556 suppressor and barrel size selections for shorter suppressors. You will need to keep in mind the fundamentals of ammunition and projectiles; the size of the barrel has a dramatic impact on the speed of the spherical. The explosion, or deflagration of powder that causes the bullet to be pressured down the barrel, begins contained in the cartridge, however continues down the size of the barrel. Sooner burning powders is shorter/faster than longer burning gun powders. For optimum effectivity, the bullet ought to keep within the barrel for many, if not all, of the burning of the gun powder. In any other case, unburned powder is wasted as flash, noise, and unused strain both on the muzzle or inside a suppressor.
Credit score: EFFECTS OF BARREL LENGTH ON BORE PRESSURE, PROJECTILE VELOCITY AND SOUND MEASUREMENT – Dater, Philip H. MD; Wong, Jason M.; 2010
For suppressor use, decrease muzzle pressures are higher to guard the lifetime of the suppressor; increased temperatures and pressures will erode steel sooner. As well as, increased muzzle pressures contained by a suppressor can have detrimental results on the weapon’s motion and improve poisonous gases across the shooter’s face.
For my part, the shortest useable barrel size for a 5.56x45mm AR-15 is 11.5 inches. The MK18 (10.3″) crew will likely be alongside shortly to argue their factors, however in addition to suppressor efficiency and longevity, terminal ballistic efficiency, particularly for small bullets, may be very velocity dependent. To attain the most effective outcomes, there must be sufficient barrel runway to attain adequate velocity.
Credit score: EFFECTS OF BARREL LENGTH ON BORE PRESSURE, PROJECTILE VELOCITY AND SOUND MEASUREMENT – Dater, Philip H. MD; Wong, Jason M.; 2010
For at the moment’s testing, the distinction between an 11.5″ barrel and a 14.5″ barrel is about 2,000 PSI on the muzzle. This hole is important sufficient for a suppression comparability between the RC2 and the RC3, particularly as a result of the brand new SureFire silencer is constructed particularly to deal with again strain, The objective of those assessments is to offer you a greater thought of what to anticipate primarily based on the barrel size of the host you intend on suppressing.
SILENCER SATURDAY #308: Barrel Lengths and the SureFire SOCOM556 RC3
I did conduct one unofficial check, which I can’t suggest you strive at dwelling. Like we identified final week, the segments that run the circumference of the RC3 finish cap are the vents the place the strain is launched ahead of the muzzle. I took a little bit of lubricating grease and plugged the vents earlier than taking a single shot. Afterwards, the vents had been utterly freed from grease. So for anybody who’s skeptical of the inner gasoline movement geometry, they do work as marketed.
SILENCER SATURDAY #308: Barrel Lengths and the SureFire SOCOM556 RC3
A remaining word about at the moment’s testing; the muzzle brake mounts I’m utilizing will not be the optimum setup for optimum flash suppression. I alluded to correct muzzle gadget choice final week, and now that SureFire has revealed their official PSA, we will focus on it right here.
It has come up not too long ago that the RC3 might exhibit suboptimal flash efficiency with closed-tine muzzle gadgets. The RC3 was designed to function optimally with SureFire SOCOM open-tine adapters (SF3P, FH556RC, WARCOMP-556-1/2-28), and delivers unmatched flash discount on this configuration. Gasoline movement dynamics in low-back-pressure suppressors are extraordinarily complicated and delicate to the slightest change. Consequently, the RC3 might have elevated muzzle flash with closed-tine adapters and muzzle brakes (SFCT-556-1/2-28, WARCOMP-556-CTN-1/2-28, SFMB).
As you’ll be able to see above, if you’re involved about flash discount, beneath evening imaginative and prescient for instance, choose an open-tine flash hider to maximise the inner gasoline movement geometry. Personally I nonetheless counsel avoiding the Warcomp flash hiders as mounts since they lack the labyrinth seals discovered on the three-tine and four-tine flash hiders (hyperlinks under). I’ve some flash hiders on the best way to check the sound suppression between brakes and flash hiders as effectively.
Let’s evaluation the numbers.
Specs – SureFire SOCOM556 RC3
Mannequin: Surefire SOCOM556-RC3
Producer’s Web page: https://www.surefire.com/socom556-rc3/
MSRP: $1799
Supplies: Inconnel
End: Cerakote
Diameter: 1.5 in (3.8 cm)
Size: 6.3 in (16.0 cm)
Size added to weapon*: 3.8 in (9.7 cm)
* Precise size might fluctuate, relying on which SureFire adapter is used
Weight: 17.0 oz (482 g)
Options:
60% much less again strain
Nearly eliminates explosive flash
ast-Connect® design permits quick, safe, simple attachment and removing with out instruments
Backward suitable with SureFire SOCOM Quick-Connect muzzle gadgets
Sturdy Inconel building delivers lengthy service life
Specs – SureFire SOCOM RC2 (Earlier Mannequin Comparability)
Mannequin: SOCOM556-RC2
Producer’s Web page: https://www.surefire.com/socom556-rc2/
MSRP: $1,199
Supplies:
End: OLC and Cerakote
Diameter: 1.5″
Size: 6.4″
Size added to weapon: 3.8″
* Precise size might fluctuate, relying on which SureFire adapter is used
Weight: 17.0 oz
Sound Knowledge @ the shooter’s ear (from SureFire)
10.3″ – 137.74
14.5″ – 136 .40
Muzzle Gadgets:
The distinction between the RC3 and the RC2 was most obvious on the 14.5″ hybrid-mid KAC gasoline system. Due to the longer barrel and gasoline system, the powder is burned extra utterly, leaving much less strain change contained in the suppressor. Leaving my left earplug partially eliminated, the RC3 was simply barely louder than the RC2. And for the reason that human ear can solely detect a 2-3 dB distinction, I’d estimate the RC3 is louder on the ear by about two decibels on this rifle.
SILENCER SATURDAY #308: Barrel Lengths and the SureFire SOCOM556 RC3
Nevertheless, each the RC3 and RC2 are what the business would contemplate “listening to protected” – someplace under 140 dB. As a reminder, supersonic centerfire rifle cartridges will all the time require listening to safety, even with a suppressor.
SILENCER SATURDAY #308: Barrel Lengths and the SureFire SOCOM556 RC3
On the 11.5″ barrel with a carbine-length gasoline system, the RC3 and RC2 carried out nearly identically, suppressing someplace round 140 dB (primarily based on my ears alone), I swapped backwards and forwards between the 2 of them and couldn’t inform the distinction.
SILENCER SATURDAY #308: Barrel Lengths and the SureFire SOCOM556 RC3
For a short-barreled carbine, these 6.4″ suppressors carried out very properly, knocking the blast all the way down to acceptable ranges. In case you had been pressured to shoot a number of rounds with this setup outdoors, with out listening to safety, you’d most likely stroll away with out critical damage. However that’s not really useful and can be reserved for an emergency scenario.
SILENCER SATURDAY #308: Barrel Lengths and the SureFire SOCOM556 RC3
As I’ve stated many occasions in earlier critiques, we don’t buy supersonic rifle suppressors for his or her absolute quietness. We suppress these carbines to drop the sound to safer ranges, masks the general signature from the enemy (or neighbors), and to make an total extra nice taking pictures expertise.
From my perspective, the RC3 makes the most important distinction on shorter barrels, the place the strain change within the suppressor is the best. on the 11.5″ right here was a noticeable shift within the cartridge ejection sample which often signifies a change in bolt pace and the pace of the bolt unlocking. So whereas the sound suppression degree between the RC3 and RC2 is sort of an identical, including the RC3 to an already over gassed carbine is not going to trigger extra strain to be launched into the system. Any modifications in barrel size, gasoline system size, ammunition, or buffer weight might affect suppressor efficiency.
Thanks for studying. Be protected, have enjoyable, and we’ll see you again right here subsequent weekend for one more Silencer Saturday.
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DEALERS: If you need your hyperlink to purchase YHM suppressors included in future Silencer Saturday posts, electronic mail: silencers@thefirearmblog.com
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