Abstract: Systems and methods for firearm receivers are described. Systems may include a receiver body, a tail; and a connection for coupling the receiver body to the tail. The receiver body and the tail may be made from different materials. A receiver system coupling apparatus may include one or more protrusions on a receiver body; and one or more one or more protrusions on a tail. The one or more protrusions on the receiver body may be coupled to the one or more protrusions on the tail to secure the receiver body to the tail. A method for producing a multiple component receiver system may include creating a receiver body from a first material; creating a tail from a second material; and coupling the receiver body to the tail with a connection.

Abstract: A ceramic honeycomb structure comprising a ceramic honeycomb body having cell walls defined by a large number of longitudinally extending cells, and an outer peripheral wall formed on an outer peripheral surface of the ceramic honeycomb body, the outer peripheral wall being formed by coating longitudinally extending grooves defined by cell walls on the outer peripheral surface of the ceramic honeycomb body with a coating material, and the outer peripheral wall having higher hardness in its outer peripheral portion than in its inside portion in a thickness direction.

Abstract: A ceramic honeycomb structure having a large number of flow paths partitioned by porous cell walls, the cell walls meeting the conditions; (a) the cell walls having porosity of 55-80%, (b) the cell walls having a median pore diameter D50 (measured by mercury porosimetry) of 5-27 ?m, (c) pores open on cell wall surfaces having an opening area ratio of 20% or more, (d) pores open on cell wall surfaces having a median opening diameter d50 (determined from equivalent circle diameters on an area basis) of 10-45 ?m, (e) the density of pores open on cell wall surfaces having equivalent circle diameters of 10 ?m or more and less than 40 ?m being 350/mm2 or more, (f) the maximum inclination of a curve of a cumulative pore volume relative to a pore diameter (determined from a pore distribution measured by mercury porosimetry) being 1.6 or more, and (g) a ratio D50/d50 of the median pore diameter D50 to the median opening diameter d50 being 0.65 or less.

Abstract: A ceramic honeycomb structure having a large number of flow paths defined by porous cell walls having porosity of 45-68% and an average pore size of 15-35 ?m, the volume of pores having diameters of more than 50 ?m being more than 10% and 25% or less of the total pore volume, the volume of pores having diameters of 100 ?m or more being 1-8% of the total pore volume, the volume of pores having diameters of less than 10 ?m being 3-10% of the total pore volume, and the pores having a pore size distribution deviation ? [=log(D20)?log(D80)] of 0.45 or less, wherein D20 represents a pore size (?m) at a pore volume corresponding to 20% of the total pore volume, and D80 represents a pore size (?m) at a pore volume corresponding to 80% of the total pore volume, in a curve showing the relation between a pore size and a cumulative pore volume obtained by accumulating a pore volume from the maximum pore size to a particular pore size, and D80<D20.

Abstract: A method for producing a ceramic honeycomb structure comprising a ceramic honeycomb body comprising large numbers of axially extending cells defined by cell walls, and an outer peripheral wall formed on an outer peripheral surface of the ceramic honeycomb body, comprising the steps of applying a coating material comprising elongated colloidal silica particles to the outer peripheral surface, and drying the coating material to form the outer peripheral wall.

Abstract: A ceramic honeycomb structure having a large number of flow paths partitioned by porous cell walls, the cell walls meeting the conditions; (a) the cell walls having porosity of 55-80%, (b) the cell walls having a median pore diameter D50 (measured by mercury porosimetry) of 5-27 ?m, (c) pores open on cell wall surfaces having an opening area ratio of 20% or more, (d) pores open on cell wall surfaces having a median opening diameter d50 (determined from equivalent circle diameters on an area basis) of 10-45 ?m, (e) the density of pores open on cell wall surfaces having equivalent circle diameters of 10 ?m or more and less than 40 ?m being 350/mm2 or more, (f) the maximum inclination of a curve of a cumulative pore volume relative to a pore diameter (determined from a pore distribution measured by mercury porosimetry) being 1.6 or more, and (g) a ratio D50/d50 of the median pore diameter D50 to the median opening diameter d50 being 0.65 or less.

Abstract: A method for producing a ceramic honeycomb structure comprising a ceramic honeycomb body having large numbers of longitudinally extending cells defined by cell walls, and an outer peripheral wall formed on an outer peripheral surface of the ceramic honeycomb body, comprising the steps of applying a coating material comprising colloidal silica having an average particle size of 4-150 nm to longitudinally extending grooves defined by cell walls on the outer peripheral surface of the ceramic honeycomb body, and induction-drying the coating material to form the outer peripheral wall.

Abstract: A cordierite-based ceramic honeycomb filter comprising a honeycomb structure having a large number of flow paths partitioned by porous cell walls, and plugs alternately formed in said flow paths on the exhaust-gas-inlet side or the exhaust-gas-outlet side for permitting an exhaust gas to pass through said porous cell walls to remove particulate matter from the exhaust gas, said porous cell walls having porosity of 45-58%, an average pore size of 15-30 ?m, the volume of pores having pore sizes exceeding 50 ?m being more than 10% and 25% or less of the total pore volume, the volume of pores having pore sizes of 100 ?m or more being 1-8% of the total pore volume, the volume of pores having pore sizes of less than 10 ?m being 3-10% of the total pore volume, and said pores having a pore size distribution deviation ? [=log(D20)?log(D80)] of 0.

Abstract: A method for producing a ceramic honeycomb structure having a large number of paths partitioned by porous cell walls, the cell walls having thickness of 0.17-0.45 mm and porosity of 40% or more, comprising the steps of preparing a moldable material comprising a ceramic material powder, a binder, a pore-forming material and water, extruding the moldable material to form a honeycomb-shaped green body, and drying and sintering the green body, the pore-forming material having a melting point of 40-110° C., being solid in the moldable material, and being melted in the drying step so that 25% or more thereof is removed from the green body in the drying step.

Abstract: A ceramic honeycomb structure having a large number of flow paths defined by porous cell walls; said porous cell walls being composed of cordierite crystals, mullite crystals, corundum crystals and/or spinel crystals; the percentage of the X-ray diffraction intensity of the cordierite crystals being 72% or more and less than 85%, the percentage of the X-ray diffraction intensity of the mullite crystals being 15-25%, and the percentage of the total X-ray diffraction intensity of the corundum crystals and the spinel crystals being 5% or less, per the total X-ray diffraction intensity of these crystals; said porous cell walls having a true density of 2.55-2.70 g/cm3, a mean pore diameter of 10-20 ?m, and a porosity of 50-65%; the volume of pores having diameters exceeding 50 ?m being 8-25% of the total pore volume, the volume of pores having diameters of less than 10 ?m being 16-25% of the total pore volume, and the pore diameter distribution deviation ? being 0.5 or less.

Abstract: A method for producing a cordierite-based ceramic honeycomb filter comprising the steps of introducing a plugging material of a cordierite-forming material into predetermined flow paths of a sintered, cordierite-based ceramic honeycomb having an outer diameter of 150 mm or more, and drying and sintering the resultant plugs, the sintering step comprising a temperature-elevating process, a temperature-keeping process and a temperature-lowering process, and the temperature-elevating process having a temperature-elevating speed of 70-500° C./hr from 800° C. to the highest keeping temperature.

Abstract: A ceramic honeycomb filter comprising a ceramic honeycomb structure having large numbers of flow paths partitioned by porous cell walls, and plugs disposed in the flow paths alternately on the exhaust gas inlet or outlet side, to remove particulate matter from an exhaust gas passing through the porous cell walls; the porous cell walls having porosity of 45-75%, the median pore diameter A (?m) of the cell walls measured by mercury porosimetry, and the median pore diameter B (?m) of the cell walls measured by a bubble point method meeting the formula of 35<(A?B)/B×100?70, and the maximum pore diameter of the cell walls measured by a bubble point method being 100 ?m or less.

Abstract: A ceramic honeycomb structure having a large number of flow paths partitioned by porous cell walls, the cell walls meeting the conditions; (a) the cell walls having porosity of 55-80%, (b) the cell walls having a median pore diameter D50 (measured by mercury porosimetry) of 5-27 ?m, (c) pores open on cell wall surfaces having an opening area ratio of 20% or more, (d) pores open on cell wall surfaces having a median opening diameter d50 (determined from equivalent circle diameters on an area basis) of 10-45 ?m, (e) the density of pores open on cell wall surfaces having equivalent circle diameters of 10 ?m or more and less than 40 ?m being 350/mm2 or more, (f) the maximum inclination of a curve of a cumulative pore volume relative to a pore diameter (determined from a pore distribution measured by mercury porosimetry) being 1.6 or more, and (g) a ratio D50/d50 of the median pore diameter D50 to the median opening diameter d50 being 0.65 or less.

Abstract: A ceramic honeycomb structure having a large number of flow paths partitioned by porous cell walls, the cell walls having porosity of 40-60%; pores opening on the cell wall surface having an opening area ratio (the total opening area of pores opening on the cell wall surface per a unit area) of 15% or more; the median opening diameter of the opening pores being 10 ?m or more and less than 40 ?m, when the opening diameter of each pore opening on the cell wall surface is expressed by an equivalent circle diameter (a diameter of a circle having the same area as the opening area of each pore); the density of pores having equivalent circle diameters of 10 ?m or more and less than 40 ?m being 350/mm2 or more; and the average circularity of pores having equivalent circle diameters of 10 ?m or more and less than 40 ?m being 1-2.

Abstract: A ceramic honeycomb structure having a large number of flow paths defined by porous cell walls; said porous cell walls being composed of cordierite crystals, mullite crystals, corundum crystals and/or spinel crystals; the percentage of the X-ray diffraction intensity of the cordierite crystals being 72% or more and less than 85%, the percentage of the X-ray diffraction intensity of the mullite crystals being 15-25%, and the percentage of the total X-ray diffraction intensity of the corundum crystals and the spinel crystals being 5% or less, per the total X-ray diffraction intensity of these crystals; said porous cell walls having a true density of 2.55-2.70 g/cm3, a mean pore diameter of 10-20 ?m, and a porosity of 50-65%; the volume of pores having diameters exceeding 50 ?m being 8-25% of the total pore volume, the volume of pores having diameters of less than 10 ?m being 16-25% of the total pore volume, and the pore diameter distribution deviation ? being 0.5 or less.

Abstract: A ceramic honeycomb structure having a large number of flow paths defined by porous cell walls having porosity of 45-68% and an average pore size of 15-35 ?m, the volume of pores having diameters of more than 50 ?m being more than 10% and 25% or less of the total pore volume, the volume of pores having diameters of 100 ?m or more being 1-8% of the total pore volume, the volume of pores having diameters of less than 10 ?m being 3-10% of the total pore volume, and the pores having a pore size distribution deviation ? [=log(D20)?log(D80)] of 0.45 or less, wherein D20 represents a pore size (?m) at a pore volume corresponding to 20% of the total pore volume, and D80 represents a pore size (?m) at a pore volume corresponding to 80% of the total pore volume, in a curve showing the relation between a pore size and a cumulative pore volume obtained by accumulating a pore volume from the maximum pore size to a particular pore size, and D80<D20.

Abstract: A method for producing a honeycomb filter from a honeycomb structure having large numbers of flow paths partitioned by cell walls, comprising inserting a tubular member into each of the flow paths, and injecting a plugging material into each of the flow paths from the tubular member to form a plug in each of the flow paths at a position separate from the end surface of the honeycomb structure, the tubular member having an outer diameter that is 40-90% of the opening size of the flow path, the plugging material comprising at least a ceramic material having a maximum particle size that is 85% or less of the inner diameter of the tubular member, and an average particle size of 1 ?m or more.

Abstract: A cordierite-based ceramic honeycomb filter comprising a honeycomb structure having a large number of flow paths partitioned by porous cell walls, and plugs alternately formed in said flow paths on the exhaust-gas-inlet side or the exhaust-gas-outlet side for permitting an exhaust gas to pass through said porous cell walls to remove particulate matter from the exhaust gas, said porous cell walls having porosity of 45-58%, an average pore size of 15-30 ?m, the volume of pores having pore sizes exceeding 50 ?m being more than 10% and 25% or less of the total pore volume, the volume of pores having pore sizes of 100 ?m or more being 1-8% of the total pore volume, the volume of pores having pore sizes of less than 10 ?m being 3-10% of the total pore volume, and said pores having a pore size distribution deviation ? [=log(D20)?log(D80)] of 0.