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This is an excellent spring guide that is made COMPLETELY made of metal unlike other springs guides whose shafts are made of some reinforced plastic. This piece fits nicely into my ICS M4 upper gearbox, and of course, you can still use the outer ICS screw that fixes the spring guide to the gearbox.
I also installed another JBU spring guide into my JG M4 without any problems.
5/5 stars for this no-brainer product!
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