Laylax PROMETHEUS EG Spring Guide for M4/HK416/HK417 NGR

Laylax PROMETHEUS EG Spring Guide for M4/HK416/HK417 NGR This item has thrust bearing arranged on a load surface for reducing the various resistance at spring compression. The guide member has a rotary tornado shaft which is superior to self-lubrication and anti-friction/wear. This double smooth effect will be reduced the resistance and make the maximum performance.