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I have a HK91 with a Williams set trigger pack. Let's say I also have a PSG-1 trigger pack with a .308 ejector. Can I simply do a swap of these trigger packs....ie: take out the Williams, replace it with the PSG-1, and be good to go without any further modifications?
 

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Yes. Assuming you have the correct PSG1 selector and a metal housing. The PSG1 has a propietary selector and will only work with a metal housing. If you want to use the PSG1 pack with a plastic housing then you will need a MSG90 selector.
 
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