.40 S&W JR Carbine review
- Thread starter A&Shuntr
- Start date
Shooter1of38
CGN Ultra frequent flyer
http://www.justrightcarbines.com/FAQs.html
Q: When will you offer the JR Carbine in 10mm?
The JR Carbine is a direct-blowback design. The bolt is entirely inertial and does not lock when in battery, and the barrel breech does not depress upon firing, so there is no mechanical action to absorb some of the recoil energy as there is in the 1911 or Glock, for example.
When the gun is fired the bolt's mass is not enough by itself to sufficiently slow the bolt's recoil, even when using the standard AR-15 aluminum buffer with its own internal sliding weights. In order to adequately slow the JR Carbine's bolt down the bolt in the JR Carbine it has a solid steel buffer to augment the mass of the bolt. Our buffer is significantly heavier than the standard AR-15 aluminum buffer, and is sufficient for the energies developed by the 9mm, 40S&W. and 45ACP.
Unfortunately, the full power 10mm generates too much energy (37,500 psi) to accommodate through increased buffer mass within the limited confines of the buffer tube and still permit sufficient fore-and-aft bolt travel for the gun to function. Using a significantly denser material for the buffer - like tungsten, for example - might accommodate the higher power of the 10mm, but it would be cost prohibitive. Using reduced power 10mm cartridges might work, but then the performance would be much like the 40S&W and the advantage of the 10mm would be lost. For these reasons we do not plan to offer the JR Carbine in 10mm (or other high power cartridges such as .357 Sig, .40 Super, or .460 Rowland, for example).
Q: When will you offer the JR Carbine in 10mm?
The JR Carbine is a direct-blowback design. The bolt is entirely inertial and does not lock when in battery, and the barrel breech does not depress upon firing, so there is no mechanical action to absorb some of the recoil energy as there is in the 1911 or Glock, for example.
When the gun is fired the bolt's mass is not enough by itself to sufficiently slow the bolt's recoil, even when using the standard AR-15 aluminum buffer with its own internal sliding weights. In order to adequately slow the JR Carbine's bolt down the bolt in the JR Carbine it has a solid steel buffer to augment the mass of the bolt. Our buffer is significantly heavier than the standard AR-15 aluminum buffer, and is sufficient for the energies developed by the 9mm, 40S&W. and 45ACP.
Unfortunately, the full power 10mm generates too much energy (37,500 psi) to accommodate through increased buffer mass within the limited confines of the buffer tube and still permit sufficient fore-and-aft bolt travel for the gun to function. Using a significantly denser material for the buffer - like tungsten, for example - might accommodate the higher power of the 10mm, but it would be cost prohibitive. Using reduced power 10mm cartridges might work, but then the performance would be much like the 40S&W and the advantage of the 10mm would be lost. For these reasons we do not plan to offer the JR Carbine in 10mm (or other high power cartridges such as .357 Sig, .40 Super, or .460 Rowland, for example).
