
If you have questions about the conjugation of многоугольный or Russian adjectives in general, you can practice and get feedback from a professional tutor.
- Не могу назвать калибр, но эта многоугольная бороздка вдоль наружного ободка характерна для ствола Глока.
Can't tell the caliber, but this polygonal rifling along the outer rim is consistent with the barrel of a glock. Hmm.