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It is one of those tiny parts nobody thinks about until it goes missing, and then the whole front end of your rifle depends on it. This is the genuine Springfield Armory castle nut set screw, also called the capsocket screw, and it is the small piece that threads through the front sight base to keep the castle nut from backing off under recoil. Lose it or strip it during a flash suppressor swap and this is the correct factory replacement.
On the M1A, the castle nut threads onto the barrel and locks the flash suppressor in position. This set screw is what pins that nut so it does not walk loose from the vibration of firing. It is a genuine OEM component built from black finished steel, and being a real factory part means the fit and threads match what the rifle was designed around instead of a close-enough substitute.
This piece is made for the Springfield Armory M1A platform in .308 Win / 7.62x51mm, which covers the popular variants like the Standard, Loaded, Scout Squad, and SOCOM 16. If you are running an M14-pattern rifle, it is the same part number the community reaches for. A quick tip from folks who have done this job: use the castle nut pliers to rock the lock nut slightly and center the hole before you back the screw out, which keeps you from stripping the head.
Set screws like this are cheap insurance. Guys who have wrenched on these rifles will tell you not to reuse a screw that has been stripped or chewed up, so keeping a fresh one in the parts drawer is never a bad idea. Whether you are replacing a lost screw or building out a spares kit, this is the correct MA0513 straight from Springfield Armory.
It threads through the front sight base and locks the castle nut so it cannot back off under recoil. On the M1A, the castle nut secures the flash suppressor to the barrel, so this little screw is what keeps everything from working loose over time. Without it, repeated firing can let the nut vibrate out of position.
Yes. It is the OEM Springfield Armory part designed for the M1A platform in .308 Win / 7.62x51mm, and it is the same screw M14-pattern owners use. That covers common variants like the Standard, Loaded, Scout Squad, and SOCOM 16.
Before backing it out, use the castle nut pliers to gently rock the lock nut back and forth to center the hole on the screw. That keeps the nut from binding on the threads so you do not strip the head or the internal drive. A quality hex wrench that fits snugly makes a big difference too.
If the old screw is stripped, chewed up, or has been in place for a long time, replace it. Experienced M1A owners generally recommend installing a fresh one rather than reusing a compromised screw, since there is no real savings in fighting a stripped part later. This genuine MA0513 is the correct factory replacement.
| UPC | 706397857806 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MA0513 |
| Model |
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