Not a repair but more of a mod. After press fitting a slant break on my SAR1, I didn't like the look with out the muzzle attachment retaining pin. After looking around in the shop I found a nail which fit perfect in the front sight base. I installed the nail in my drill chuck and polished it up. Cut to size I filed the retaining notch in the center of the pin. Lapped the ends to square it up, degreased and blued with cold blue. Now for the spring, dug through our box of old pens till I found a spring of correct diameter, cut this to size. Drove out the front sight retaining pin, installed the spring followed by my homemade pin, reinstalled the sight base pin. Just like the original, can't tell the difference. And "Made in America" increases my parts count. LOL!