刚才群里有人在说手枪可以配加长的弹匣,就像格劳靠18给配的33发(其实是31发,底下用了个+2 extension)。 我写了几句这样的弹匣可能给枪的可靠性带来负面影响,贴这儿增加点儿讨论话题。 这两天好像没什么人吵架。。。
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大容量的弹匣本身就是对枪的可靠性一个潜在的威胁。 半自动手枪的可靠性就像我们说a chain is only as strong as its weakest link,而半自动的weakest link很多时候就是那个可以更换,可以随意改变原定的生产厂家,长度容量等等的弹匣。 弹匣的供弹可靠性要求弹簧的弹力要从第一发到最后一发保持恒定,而coil spring本身的局限性就是压缩的越紧,弹力越大。 等基本上放松了就最小。 所以最大值和最小值在设计时就有specs。 把弹匣从10发拉到30发,这根弹簧就有了一个非常hard time to keep those values in spec。。。
upper和lower都是Foxtrot Mike只是分开买的
FM的upper是Colt Mil-Spec
Aero EPC的LRBHO是在upper
FM 9mm的LRBHO是在lower
如果用Aero EPC lower+FM 9mm upper会失去LRBHO功能
FM 9mm和Extar在用Glock原厂和ETS还有Magpul弹夹有个问题 弹夹最大容量减去一颗才能正常卡到lower 原因可能是BCG下面凸起会下压弹夹的弹簧但弹夹的弹簧在满弹情况下是没有空间下压所以弹夹无法被卡住
EPC-9 Upper Receiver Features:
Last round bolt hold open mechanism
Accepts most AR15 compatible barrel nuts and handguards
Dimple above threads to allow for proper handguard timing
Standard AR15 takedown/pivot pin lug pattern
Machined from custom forged 7075-T6 aluminum
FM Products offers a AR-15 9MM Premium Complete Lower
Crafted from billet 7075-T6 aircraft grade aluminum
Accepts MIL-SPEC components
Reliable last round bolt hold open
Compatible with Glock style magazines
Lifetime Warranty
100% Made in America
Standard with QD End Plate too
Patented Proprietary Last Round Bolt Hold Open, best on the market.
Premium Ambidextrous Selector standard
Defiance Pistol Grip
Premium 6.5 oz Buffer with reciprocating Tungsten Weights
.308 carbine recoil spring
Premium Nickel Teflon GI Trigger
Anti-Rotating Pins
FM PRODUCTS AR-15 9MM COMPLETE SIDE CHARGING UPPER – 7″
Machined from premium 6061-T6 aluminum
Proprietary handguard / upper interlock keeps handguard true to the upper
Limited lifetime warranty through Foxtrot Mike Products
Complete upper includes bolt carrier group and charging handle.
Compatible with a large variety of Glock magazine 9mm lower receivers
8.5″ M-LOK compatible handguard
7″ Premium Match Grade 41V50 Barrel w/ QPQ (1/2X36)
Proprietary Flash Comp
Metal Folding Paratrooper Charging Handle
FM Grippz Rail Covers