Get the complete blaster files, including these, at https://www.thingiverse.com/thing:3781794
This is a replica of the t-tracks used to dress up the Sterling SMG L2A3 as an E11 blaster. I modeled them from t-tracks I purchased and from reference dimensions found on FISD. Six total t-tracks are required. Print (6) t-tracks, cut to length, gently heat and bend them.
Looking from the rear of the blaster:
12:00 (9 holes)
1:30 (9 holes)
3:00 (9 holes)
4:30 (9 holes)
9:00 (10 holes)
10:30 (9 holes)
Please consult reference pictures before using adhesive.