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Posted: 8/11/2017 3:46:58 PM EDT
What is truly considered ID for a hand guard, the minimum or maximum I'D? Would it not be the diameter of the circumference of the innermost
This particular rail was stated to have an ID of 1.45" I am being told by their customer service that the dimension that I am measuring to be 1.479" is 1.45" by their measurements. Either way this is disappointing. I was assuming that the minimum ID would be 1.45". The 1.479" dimension seems pointless to list as it is not useable area. |
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As Senior Designer for an Engineering team, I'm not seeing how 1.361 and 1.372 are different. They should be the same dimension, given a quality extrusion. With that said, those numbers would constitute an ID. All others would be denoted differently.
I feel your pain, though. Recently, I was building an upper for a friend. He wanted a particular gas piston and several rail choices. I contacted the piston company and obtained dimensions. I used these to verify fitment with the rail Mfr's. Everyone said it wouldn't fit. I guess they were covering their ass, cause it went together w/o issue. |
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Quoted:
What is truly considered ID for a hand guard, the minimum or maximum I'D? Would it not be the diameter of the circumference of the innermost http://i.imgur.com/I2MEsxf.jpg This particular rail was stated to have an ID of 1.45" I am being told by their customer service that the dimension that I am measuring to be 1.479" is 1.45" by their measurements. Either way this is disappointing. I was assuming that the minimum ID would be 1.45". The 1.479" dimension seems pointless to list as it is not useable area. Inner I.D. should be the smallest dimension, period. As stated, the quoted 1.45" dimension is useless when attempting to determine fitment. As far as the variance in dimension, quality goes a long way towards tolerances. |
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I agree with user55645.....11 thou is some rediculously loose tolerance to hold on that ID.
ETA: out of curiosity, what did you use to measure? If using calipers you have to be careful to use the correct amount of pressure as you can cause false readings by either being inconsistent or using too much/too little pressure on the wheel |
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