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In physics, a shock wave (also spelled shockwave), or shock, is a type of propagating disturbance. When a wave moves faster than the local speed of sound in a fluid it is a shock wave. Like an ordinary wave, a shock wave carries energy, and can propagate through a medium; however it is characterized by an abrupt, nearly discontinuous change in pressure, temperature and density of the medium. In supersonic flows, expansion is achieved through an expansion fan also known as a Prandtl-Meyer expansion fan.
Unlike solitons (another kind of nonlinear wave), the energy of a shock wave dissipates relatively quickly with distance. Also, the accompanying expansion wave approaches and eventually merges with the shock wave, partially cancelling it out. Thus the sonic boom associated with the passage of a supersonic aircraft is the sound wave resulting from the degradation and merging of the shock wave and the expansion wave produced by the aircraft.
When a shock wave passes through matter, energy is preserved but entropy increases. This change in the matter's properties manifests itself as a decrease in the energy which can be extracted as work, and as a drag force on supersonic objects; shock waves are strongly irreversible processes.
SB Tactical Brace for shotguns. Very lightly used, only two range trips. It greatly improves ergonomics and ability to hit your target, but I decided I prefer the standard setup a bit more. I bought this for $160 last Summer, they cost $200 now and are sold out almost everywhere. Asking for $140...
Mesa Tactical Ar-15 buffer tube and grip adapter for Mossberg 500 platform (including shockwave)
Mesa Tactical sureshell aluminum side saddle carrier with built in picatinny rail
$160 for both, trades welcome, see other ads
Brand new, never used matrix arms over the receiver side saddle for mossberg models 500, 590 and shockwaves. Side saddle sits right over the receiver and bolts onto the factory holes on all models. Comes with 6 shell holders which you can add two more on the other side or remove some as each one...
Back up for grabs. Posting because the gun doesn’t get enough attention.
Factory fde with sidesaddle installed. Gun itself is 4+1 and sidesaddle holds 6. That’s running 2 3/4 shells. Chambered for 2 3/4 and 3 inch for your discretion.
Open to trades, as to what you may ask? Firearms, worst I...
Picked this up recently on a whim and I like where the safety is on the 870 platform better. This has seen zero rounds and has just sat in the box.
Doing a catch and release with this one. $475. Just want what I paid for it. Transfer at either Pantel Tactical, Sound Loan, or Precise Shooter...
I have a brand new in box Mossberg 590 with 20" barrel and 8+1 capacity. It has a bead sight and bayonet lug. It also comes with a factory pistol grip as well as the box and paperwork from the factory. Nothing is wrong with it, I've just purchased two 590s in the last couple of months and...
I was stupid and impulse bought the shockwave for $550 last year.
I have never fired this thing. Took it out of the box and put on a nice rubber sleeve. Thought that I would go have fun but life ended up taking...
This is one Firearm in a sizeable collection available due to a inheritance from a family member earlier this year. We are looking to sell the firearms and accessories and are not looking for trades. Thank you for not making trade offers. My father was a collector and but had not been shooting...
Before reading further, please acknowledge:
1) Do not comment or post in this thread. Please PM with any comments or questions.
----I wish to keep this ad simple and uncluttered. I will respond to your pms.---
2) Price is firm and no trades wanted, at all . If the ad is up, it is still...
Recently got a Smith & Wesson Shield 2.0 9mm with Crimson Trace light and laser combo for a daily carry. Waiting on my CPL background check to go through and my StealthGearUSA IWB Mini to get finished.
Also recently picked up a Mossberg Shockwave and a KAC SR-15 lower to start on my AR pistol...