几款投标美军“precision sniper rifle”的枪是怎么固定枪管的？

凉冰

The Precision Sniper Rifle (PSR) was a program by United States Special Operations Command to replace all current bolt-action sniper rifles in use by United States special operations snipers with a single bolt-action rifle chambered for a large caliber Magnum chambering like .300 Win Mag, and .338 Lapua Magnum. The solicitation was placed on January 15, 2009. The contract was awarded to Remington Arms for their Modular Sniper Rifle.

Sniper Rifle requirements included:
The system shall be chambered to safely fire factory produced "non-wildcat" Small Arms Ammunition Manufacturing Institute (SAAMI) or Commercial European standard (CIP) ammunition.
The action can be either manually or gas operated and available in left and right hand versions.
With primary day optic and ammunition the system shall provide 1.0 MOA from 300 to 1500 meters (in 300 meter increments) when fired from the shoulder or an accuracy fixture in nominal conditions.
This is further defined as 1 MOA Extreme Vertical Spread for all shots in a 10 round group at the stated distances.
Mean Rounds Between Failures (MRBF) shall be 1000 rounds.
The system shall have an overall length no greater than 52" in full configuration / extended excluding suppressor with a single component no greater in length than 40".
The system shall weigh no more than 18 lbs with a 12:00 MilStd 1913 rail and a loaded magazine with 5 rounds.
The system shall be capable of operator breakdown into major components in less than two minutes.
The system will assemble from the major component breakdown in less than two minutes by the operator.
The system will assemble from breakdown with no change in weapon zero.
The system will have an integral MilStd 1913 rail at the 12:00 position, the rail will be capable of maintaining bore sight alignment and weapon zero while conducting routine firing combined with combat movement and operational training drills.

Contenders for the contract included:
Accuracy International AX 338
ArmaLite AR-30
Barrett MRAD (Multi-Role Adaptive Design)[11]
Blaser Tactical 2
Desert Tactical Arms SRS
FN Ballista[12]
PGM 338
Remington Modular Sniper Rifle[13]
Sako TRG M10.

以上是霉菌招标的要求和几款参与投标的型号，我也看了一些视频，但是对于这些枪型是怎么实现快速更换和紧固管子那个地方我没明白，似乎除了AI家的之外都是采用了extension barrel 的结构。
版上应该也有大佬买了以上某款的枪吧，能否告知一些呢？

蟹蟹

凉冰

紧靠外部几个螺丝抵住管子外壁就能卡住？这些枪很多都用的是.338PM这样的口径啊，

凉冰

ssg3000 的管子也是这样光溜溜的，

凉冰

我不知道怎么描述我的问题哈，
MSR 和 AR15是一样的，管子上有个台阶会卡住，
但是ssg3000这类的管子就不是这样的，横向拧紧几个机匣上的螺丝，

凉冰

难度说  要你命3000  机匣的内径在拧紧这3个螺丝后会变小，然后牢牢卡主管子吗？

凉冰

zacvoid 发表于 2019-1-19 14:27
TRG M10、Ballista都是靠拧紧barrel extension
MSR是用类似AR15的Barrel nut，要用专门工具拧下来
TAC2是机 ...

我没有实际操作更没拆解看这些枪的内部结构过，请问这些枪是具体怎么紧固枪管的， 例如ssg3000这枪

凉冰

军火大a 发表于 2019-1-21 02:45
你youtube上搜一下不就得了。。。。ballista barrel change，MRAD barrel change，TRGM10 barrel change ...

视频看了10+个，基本都是拧松了螺丝拔出管子再插上新的，bolt 换掉 bolt head ，拧紧螺丝

看不到里面的结构

凉冰

军火大a 发表于 2019-1-21 03:13
都差不多。。。一个index销用来定位，剩下的螺丝就是夹住管子。
结构和这玩意一样。无视那三个绿帽螺丝
...

我也是这样认为的，拧紧螺丝后这个内径就变小了卡住管子
但是一细想，那不就是等于是机匣要有一个形变了么 ，