在转轮手枪枪管下方突出的杆状结构，用来增加枪管的强度与稳定度，并且有助调整重量平衡。分为两类：全凸杆（full-lug）和半凸杆（half-lug）。全凸杆一直延伸到枪口，提供额外重量以抵销后座力和枪口上扬现象，为多数射击选手及猎人采用。半凸杆则只延伸到枪管一半位置。
端面有间隙、无凸台对接是指在上、下套管之间留有一定间隙，上、下主弦杆端面同时接触对接。
End face with a gap, no boss butt is refers to the upper and lower casing left a certain gap between the upper and lower main chord rod end face at the same time contact.
窄长高凸的果岭加上正前方的砂坑，选对球杆，加上良好的准度，才可以标准杆完成。
The narrow, long elevated green, plus the bunker right at the front, makes this hole a test of club selection and tee shot accuracy.
论述了采用金属梯度性能材料优化拉杆类、压杆类、简支梁类、凸模类机械零件设计问题。
The design of mechanical parts, such as draw poles press poles, simple su stain girders and protruding models type parts may be optimized by use of metal gradient materials.
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